{"name":"起重机司机（Q2）题库","level":"特种设备作业人员证","org":"市场监督管理部门","count":300,"questions":[{"id":1,"type":"single","difficulty":"基础","stem":"臂架起重机工作幅度通常指哪段水平距离？","options":["回转中心至吊钩垂线","臂架根部至臂架顶部","支腿中心至配重中心","吊钩中心至地面投影"],"answer":[0],"explanation":"AI 生成、仅供复习参考。知识点：工作幅度。A项正确：它是载荷相对回转中心的水平力臂。B项错误：这是臂架长度相关距离。C项错误：这是支承与配重位置关系。D项错误：这是高度相关距离。","tier":"基础"},{"id":2,"type":"single","difficulty":"基础","stem":"在吊重不变时增大工作幅度，起重力矩如何变化？","options":["力矩减小而吊重不变","力矩增大而吊重不变","力矩不变而幅度增大","力矩减小而幅度增大"],"answer":[1],"explanation":"AI 生成、仅供复习参考。知识点：起重力矩。A项错误：幅度增加不会减小力矩。B项正确：力矩为吊重与幅度的乘积。C项错误：幅度变化会改变力矩。D项错误：幅度增加会增大力矩。","tier":"基础"},{"id":3,"type":"single","difficulty":"基础","stem":"确定某一工况允许起重量时，应首先查阅什么资料？","options":["钢丝绳公称破断拉力表","吊钩组件材料强度表","对应配置工况的载荷表","起升电机额定功率表"],"answer":[2],"explanation":"AI 生成、仅供复习参考。知识点：载荷表。A项错误：绳强度不能代替整机能力。B项错误：吊钩强度不是整机允许载荷。C项正确：载荷表对应幅度和配置限制。D项错误：电机功率不能单独确定能力。","tier":"基础"},{"id":4,"type":"single","difficulty":"基础","stem":"起升高度限位装置的主要作用是什么？","options":["限制吊物水平运行速度","限制臂架水平回转角度","限制吊物静态承载重量","防止吊钩继续上升越位"],"answer":[3],"explanation":"AI 生成、仅供复习参考。知识点：高度限位。A项错误：这是运行速度控制。B项错误：这是回转范围控制。C项错误：这是载荷限制相关功能。D项正确：高度限位防止上升越位。","tier":"基础"},{"id":5,"type":"single","difficulty":"基础","stem":"起重量限制器主要针对哪种危险状态发挥保护作用？","options":["吊载超过允许起重量","吊钩接近上升终点位","大车接近轨道终点位","吊物进入预设回转区"],"answer":[0],"explanation":"AI 生成、仅供复习参考。知识点：起重量限制。A项正确：检测超载并按设计限制危险动作。B项错误：属于高度限位功能。C项错误：属于运行限位功能。D项错误：属于回转区域限制功能。","tier":"基础"},{"id":6,"type":"single","difficulty":"基础","stem":"正式起吊前进行低位试吊，主要检查哪组内容？","options":["检查回转限位与幅度显示","检查制动状态与绑扎平衡","检查支腿伸出与臂架长度","检查起升倍率与速度档位"],"answer":[1],"explanation":"AI 生成、仅供复习参考。知识点：试吊。A项错误：这些须按流程检查但不替代试吊核验。B项正确：低位试吊可核验制动和绑扎重心状态。C项错误：这些属于配置检查而非试吊主要目的。D项错误：这些属于配置操作检查而非试吊主要目的。","tier":"基础"},{"id":7,"type":"single","difficulty":"基础","stem":"司机不能辨认起吊指挥信号时应怎样操作？","options":["降低起升速度后继续吊运","按前次手势含义继续吊运","停止动作并重新确认信号","改按吊物摆动方向起吊"],"answer":[2],"explanation":"AI 生成、仅供复习参考。知识点：指挥信号。A项错误：降速不能消除信号不明。B项错误：不能推测本次信号。C项正确：信号明确后才能继续。D项错误：摆动不是有效指挥。","tier":"基础"},{"id":8,"type":"single","difficulty":"基础","stem":"作业中收到现场人员明确的紧急停止信号时，应怎样处理？","options":["等指定指挥员复述后停车","先完成本段运行再停车","只在发现超载时才停车","立即停止并核实现场情况"],"answer":[3],"explanation":"AI 生成、仅供复习参考。知识点：紧急停止。A项错误：紧急停车不应等待复述。B项错误：完成运行可能扩大危险。C项错误：紧急信号不只针对超载。D项正确：任何人发出紧急停止均应响应。","tier":"基础"},{"id":9,"type":"single","difficulty":"基础","stem":"吊钩未处于吊物重心上方而斜拉起吊，主要增加哪种风险？","options":["侧向受力及吊物摆动","垂直受力及起升速度","吊钩高度及绳端磨损","制动温度及起升倍率"],"answer":[0],"explanation":"AI 生成、仅供复习参考。知识点：斜拉歪吊。A项正确：斜拉引入侧向力且离地后可能摆动。B项错误：速度变化不是斜拉主要风险机制。C项错误：绳端磨损不是此处主要风险。D项错误：斜拉不必然改变倍率。","tier":"基础"},{"id":10,"type":"single","difficulty":"基础","stem":"对部分埋在土中的构件，应在何种状态下再按方案起吊？","options":["根据露出体积估重后","清除约束核实重量后","增加起升倍率试拉后","减小工作幅度试拉后"],"answer":[1],"explanation":"AI 生成、仅供复习参考。知识点：埋藏物吊运。A项错误：露出部分不能确定总重和约束。B项正确：须解除未知阻力并确认载荷。C项错误：增加倍率不能确认外部约束。D项错误：减小幅度不能消除未知阻力。","tier":"基础"},{"id":11,"type":"single","difficulty":"基础","stem":"吊运普通货物时发现有人站在吊物上，司机应怎样处理？","options":["降低起升速度后吊运","缩短水平路径后吊运","待人员离开后再吊运","增加一根吊索后吊运"],"answer":[2],"explanation":"AI 生成、仅供复习参考。知识点：吊物载人。A项错误：降速不能消除载人危险。B项错误：缩短路径仍存在危险。C项正确：普通吊物不得载人。D项错误：加吊索不能替代人员撤离。","tier":"基础"},{"id":12,"type":"multi","difficulty":"基础","stem":"哪些状态属于应拒绝起吊的情形？","options":["吊物重量尚未查明","指挥信号清楚统一","吊索绑扎松动不牢","吊物棱角已有衬垫"],"answer":[0,2],"explanation":"AI 生成、仅供复习参考。知识点：十不吊。A项正确：未知重量无法核对能力。B项错误：明确统一信号是安全条件。C项正确：绑扎不牢可能滑脱。D项错误：适当衬垫是防护措施。","tier":"基础"},{"id":13,"type":"single","difficulty":"进阶","stem":"同一配置载荷表显示8米幅度允许10吨、12米幅度允许6吨，吊着7吨拟移至12米时应如何判断？","options":["起吊时未超载即可外移","吊重低于10吨即可外移","缓慢外移可补偿力矩","目标工况超载不得外移"],"answer":[3],"explanation":"AI 生成、仅供复习参考。知识点：幅度变化。A项错误：必须校核全过程。B项错误：10吨仅对应8米工况。C项错误：降速不能提高静态能力。D项正确：7吨超过目标工况6吨。","tier":"进阶"},{"id":14,"type":"single","difficulty":"进阶","stem":"载荷表说明额定起重量包含吊具，吊物4.8吨且吊具0.4吨、该工况限5吨时应怎样判断？","options":["总载5.2吨超过限值","货物4.8吨未超限值","吊具0.4吨可不计入","低速起升可按5吨算"],"answer":[0],"explanation":"AI 生成、仅供复习参考。知识点：吊具计入。A项正确：应合计吊物和吊具。B项错误：忽略了吊具重量。C项错误：题定载荷表要求计入。D项错误：降速不能改变实际载荷。","tier":"进阶"},{"id":15,"type":"single","difficulty":"进阶","stem":"两肢对称吊索吊同一重物，夹角由60度增至120度时单肢拉力怎样变化？","options":["拉力减小且竖向合力不变","拉力增大且竖向合力不变","拉力不变且竖向合力增大","拉力减小且竖向合力增大"],"answer":[1],"explanation":"AI 生成、仅供复习参考。知识点：吊索夹角。A项错误：夹角增大会增大拉力。B项正确：竖向合力仍平衡重力但单肢更受力。C项错误：拉力不可能保持不变。D项错误：竖向合力仍由重量决定。","tier":"进阶"},{"id":16,"type":"single","difficulty":"进阶","stem":"方案要求保持试验载荷静止以观察结构变形，这属于哪类试验的主要检查方式？","options":["空载运转试验","额定运行试验","静载荷试验","动载荷试验"],"answer":[2],"explanation":"AI 生成、仅供复习参考。知识点：静动载辨析。A项错误：空载不施加试验载荷。B项错误：运行试验侧重带载动作。C项正确：静载侧重承载和结构表现。D项错误：动载要求机构运行。","tier":"进阶"},{"id":17,"type":"single","difficulty":"进阶","stem":"按批准方案使各机构带试验载荷反复运行，主要考查哪组性能？","options":["基础沉降与地基承载能力","结构静挠度与残余变形","支腿伸出与幅度显示精度","机构工作性能与制动可靠性"],"answer":[3],"explanation":"AI 生成、仅供复习参考。知识点：动载试验。A项错误：基础状态需核验但不是动态机构运行的主要目的。B项错误：静挠度残余变形偏向静载检查。C项错误：配置和显示检查不能替代动态性能试验。D项正确：动态运行主要检查机构及制动的工作可靠性。","tier":"进阶"},{"id":18,"type":"single","difficulty":"进阶","stem":"规定试验载荷高于某工况额定载荷，能否据此增加日常作业载荷？","options":["不能以试验载荷替代额定载荷","可按静载试验载荷日常作业","可按动载试验载荷日常作业","可在低速时按试验载荷作业"],"answer":[0],"explanation":"AI 生成、仅供复习参考。知识点：试验与作业。A项正确：试验验证不能授权超额定作业。B项错误：静载试验不是作业能力。C项错误：动载试验不是作业能力。D项错误：低速不取消额定限制。","tier":"进阶"},{"id":19,"type":"single","difficulty":"进阶","stem":"载荷表分全伸和半伸支腿工况，现场仅半伸时应如何确定能力？","options":["按全伸表值再减小起升速度","按半伸表值并核实回转区域","按全伸表值再增加配重质量","按半伸表值忽略地面承载力"],"answer":[1],"explanation":"AI 生成、仅供复习参考。知识点：支腿工况。A项错误：速度不能代替支承几何条件。B项正确：须匹配支腿伸出及区域限制。C项错误：不能擅自改配重补偿。D项错误：地面承载力仍需核实。","tier":"进阶"},{"id":20,"type":"single","difficulty":"进阶","stem":"矩形构件重心偏离几何中心，选择吊点时应优先满足什么关系？","options":["吊钩垂线对准几何中心","吊索长度保持完全相等","吊钩垂线对准实际重心","吊点间距等于构件长度"],"answer":[2],"explanation":"AI 生成、仅供复习参考。知识点：重心偏置。A项错误：几何中心不一定是重心。B项错误：等长不一定保证平衡。C项正确：重心对准可减少离地翻转。D项错误：固定间距不能替代平衡计算。","tier":"进阶"},{"id":21,"type":"single","difficulty":"进阶","stem":"吊钩上升到限位动作位置即停止，但悬吊时载荷缓慢下滑，应怎样辨析故障？","options":["高度限位失效造成下滑","回转制动失效造成下滑","起重量显示误差造成下滑","起升制动异常需停止使用"],"answer":[3],"explanation":"AI 生成、仅供复习参考。知识点：制动与限位。A项错误：限位已经能停止上升。B项错误：回转制动不控制垂直悬吊。C项错误：显示误差不能解释机械下滑。D项正确：悬吊下滑提示起升制动问题。","tier":"进阶"},{"id":22,"type":"single","difficulty":"进阶","stem":"同一设备改用较多起升倍率且其余条件不变，为什么不能直接提高整机额定起重量？","options":["整机仍受结构稳定性限制","单绳拉力会随倍率增加增大","载荷表无需匹配倍率配置","支腿能力会随倍率自动增大"],"answer":[0],"explanation":"AI 生成、仅供复习参考。知识点：多倍率。A项正确：倍率不能解除结构和稳定性限制。B项错误：同载荷下单绳力通常减小。C项错误：仍须匹配表列条件。D项错误：倍率不会自动改变支腿能力。","tier":"进阶"},{"id":23,"type":"multi","difficulty":"进阶","stem":"流动式起重机吊重和配置不变时，哪些变化通常会增加倾覆风险？","options":["工作幅度逐渐增大","按方案扩大有效支承","支腿下地面出现沉陷","吊物平稳降低离地高度"],"answer":[0,2],"explanation":"AI 生成、仅供复习参考。知识点：稳定性。A项正确：增大幅度使倾覆力矩增大。B项错误：合规支承扩大通常有利稳定。C项正确：沉陷破坏支承和水平状态。D项错误：平稳降低高度不等同增加幅度。","tier":"进阶"},{"id":24,"type":"single","difficulty":"进阶","stem":"桥式起重机起步后吊物明显摆动，下一次转运应怎样降低同类摆动？","options":["加快起步并在终点急停","平稳加减速并规划路径","提高吊钩并缩短减速段","用反向急动抵消每次摆动"],"answer":[1],"explanation":"AI 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位虽需正常，但不是熔融金属吊运特有的首要确认项。","tier":"基础"},{"id":85,"type":"single","stem":"起重机司机发现制动器在吊物悬停时出现轻微溜钩，但还能刹住，正确的处置是","options":["降低起升速度继续使用","停止作业并报修制动器","增加吊物重量测试制动","改为点动操作完成本班任务"],"answer":[1],"explanation":"知识点：制动器溜钩说明制动力矩不足，属必须停用报修的隐患。降低速度、增加吊物测试、改点动操作都是在带病运行，可能在下一次重载时完全失效。","tier":"挑战"},{"id":86,"type":"single","stem":"起重机司机在多人指挥的作业现场，正确的信号接受原则是","options":["接受任意一名指挥人员的信号","只接受持证指挥人员的信号","接受声音最大者的信号","接受距离吊物最近者的信号"],"answer":[1],"explanation":"知识点：起重机司机只接受持证指挥人员发出的信号，紧急停止信号除外。任意人员、声音大小、距离远近都不能作为接受指挥信号的依据。","tier":"进阶"},{"id":87,"type":"single","stem":"起重机司机在起吊前发现吊物重心明显偏向一侧，最合理的处置是","options":["直接起吊后在空中调整","重新绑扎使吊点对准重心","加大起升速度快速通过","用副钩斜拉校正重心"],"answer":[1],"explanation":"知识点：吊物重心偏移必须重新绑扎找正，保证吊点通过重心。直接起吊后空中调整易失控；加大速度不能解决偏载；副钩斜拉会产生水平分力，是违规操作。","tier":"进阶"},{"id":88,"type":"single","stem":"起重机司机在作业中听到起重机发出异常金属摩擦声并伴随抖动，正确的第一步是","options":["降低速度继续观察","立即停车检查","加大润滑后继续作业","记录现象下班后上报"],"answer":[1],"explanation":"知识点：异常声响和抖动可能预示机构损坏，应先停车检查。降速观察、加润滑继续、下班后上报都可能使故障扩大或造成事故。","tier":"基础"},{"id":89,"type":"single","stem":"起重机司机在吊运氧气瓶等易燃易爆物品时，应禁止的操作是","options":["使用专用吊笼吊运","吊运前检查瓶阀关闭","用钢丝绳直接捆绑瓶体","吊运时保持平稳低速"],"answer":[2],"explanation":"知识点：氧气瓶等易爆物品禁止用钢丝绳直接捆绑，应使用专用吊笼。专用吊笼、检查瓶阀、平稳低速都是正确做法，不属禁止操作。","tier":"基础"},{"id":90,"type":"single","stem":"起重机司机在正常作业中，起升机构突然断电导致吊物悬空，正确的处置是","options":["立即离开操作室求救","持续按住起升按钮","将控制器回零并鸣铃警示","手动松开制动器放下吊物"],"answer":[2],"explanation":"知识点：突然断电时吊物悬空，司机应回零、鸣铃警示并坚守岗位，防止吊物意外坠落伤人。离开操作室、按住按钮、手动松制动器都可能造成吊物失控坠落。","tier":"挑战"},{"id":91,"type":"single","stem":"起重机司机在作业前检查时，发现起升高度限位器被人为短接，正确的做法是","options":["恢复限位器功能后再作业","先作业下班前再恢复","让维修人员短接后作业","降低起升高度继续作业"],"answer":[0],"explanation":"知识点：安全装置被短接即失效，必须恢复功能后才能作业。先作业后恢复、让维修短接、降低高度继续都属带隐患运行，限位失效时冲顶事故风险极高。","tier":"挑战"},{"id":92,"type":"single","stem":"起重机司机配合地面人员用两台起重机抬吊同一重物时，最关键的要求是","options":["两台起重机起升速度相同","两台起重机额定起重量相同","两台起重机指挥信号统一","两台起重机司机经验相近"],"answer":[2],"explanation":"知识点：双机抬吊关键是统一指挥、信号一致，保证动作协调。速度相同、额定起重量相同、经验相近都不等于能协调动作，信号不统一时两机动作冲突最危险。","tier":"基础"},{"id":93,"type":"single","stem":"起重机司机在吊运钢水包前进行试吊，将钢水包吊离地面约200mm后，正确的下一步操作是","options":["静停观察制动器是否溜钩，确认无误后再继续起升","直接快速起升至所需高度以减少钢水辐射时间","边起升边向一侧回转，利用离心力稳住钢水包","先点动下降确认卷筒排绳正常再继续起升"],"answer":[0],"explanation":"知识点：试吊程序要求起吊重物离地约200mm时停车静停，检查制动器、钢丝绳受力及绑扎情况，确认无溜钩、无异常后再继续作业。A正确，静停检查制动器是试吊的核心步骤。B错误，快速起升绕过了试吊检查环节，无法发现制动失效。C错误，边起升边回转会使未确认稳定的钢水包产生摆动，风险更大。D错误，试吊静停检查的重点是制动器和绑扎，点动下降不能替代制动检查。","tier":"进阶"},{"id":94,"type":"single","stem":"起重机在起吊过程中，司机听到地面指挥人员连续急促的哨声，同时看到其双手在胸前快速交叉摆动，司机应当","options":["立即停止起升和回转动作，保持当前状态等待进一步指令","继续缓慢起升，同时鸣铃提醒下方人员避让","将吊物就近放下后再询问指挥人员意图","继续按原方向回转，认为急促哨声只是催促加快"],"answer":[0],"explanation":"知识点：起重机司机应识别指挥信号，急促哨声加双手胸前交叉摆动属于紧急停止信号，司机必须立即停止动作。A正确，紧急停止信号要求立即停止所有动作并保持现状。B错误，继续起升违背紧急停止指令，可能扩大危险。C错误，就近放下仍需动作，且方向不明可能造成碰撞。D错误，将急促哨声理解为催促属于信号误判，极易引发事故。","tier":"进阶"},{"id":95,"type":"single","stem":"关于起重机'十不吊'中'吊物上站人不吊'的掌握，下列做法符合规定的是","options":["吊物上有人但已蹲下抓牢时，可低速起吊","吊物上有人时先鸣铃示警，待其自行抓稳后起吊","只要吊物上人员系了安全带就可以起吊","吊物上无论有人与否，只要有人站立就不起吊"],"answer":[3],"explanation":"知识点：'十不吊'规定吊物上有人时严禁起吊，不存在低速、抓牢、系安全带等例外条件。D正确，只要吊物上有人站立就一律不吊。A错误，蹲下抓牢不能改变吊物上站人的事实。B错误，鸣铃示警不能替代人员撤离，起吊仍属违章。C错误，安全带不能保证人员在吊物上不被甩落或挤压，仍属禁止情形。","tier":"进阶"},{"id":96,"type":"single","stem":"起重机司机在作业中突然发现起升机构制动器失灵，吊物出现溜钩下滑，此时最恰当的处置是","options":["立即将控制器手柄拉回零位并按下急停，同时鸣铃警示下方人员撤离","反复点动起升手柄，利用电机反接制动把吊物提住","迅速将吊物向无人空旷方向回转，再设法下降","保持起升手柄在上升档，靠电机堵转阻止吊物下滑"],"answer":[0],"explanation":"知识点：制动器失灵溜钩属紧急情况，应立即停止机构动作、切断动力并警示下方人员。A正确，回零加急停切断动力并鸣铃示警，是标准应急处置。B错误，反接制动在溜钩状态下易造成电机过流或机械冲击，不能作为首选。C错误，溜钩时回转会使吊物摆动，扩大危险范围。D错误，靠电机堵转阻止下滑会烧毁电机且无法可靠制动。","tier":"挑战"},{"id":97,"type":"single","stem":"起重机司机在吊运中发现钢丝绳有一股出现断丝聚集且表面磨损明显，但尚未达到报废标准，正确的做法是","options":["降低起重量继续使用，待本班次结束后再更换","照常使用，断丝不影响钢丝绳整体承载能力","停止使用该钢丝绳并报告，由专业人员检查判定","在断丝处缠上胶布后继续吊运轻载物件"],"answer":[2],"explanation":"知识点：钢丝绳出现断丝聚集或明显磨损时应停止使用并报告检查，由专业人员按报废标准判定。C正确，停止使用并报告是保障安全的正确程序。A错误，降低起重量不能消除钢丝绳继续恶化的风险。B错误，断丝聚集会显著降低钢丝绳承载能力，不能照常使用。D错误，缠胶布只是掩盖缺陷，不改变钢丝绳已受损的事实。","tier":"挑战"},{"id":98,"type":"single","stem":"起重机司机在起吊前发现吊钩危险断面出现塑性变形，钩口开口度明显增大，正确的处置是","options":["用钢丝绳捆扎钩口后继续使用","降低额定起重量继续使用","停止使用并更换吊钩","用锤击矫正钩口后继续使用"],"answer":[2],"explanation":"知识点：吊钩出现塑性变形、开口度增大即达到报废条件，必须停止使用并更换。C正确，塑性变形说明吊钩已失去原有承载能力。A错误，捆扎钩口不能恢复吊钩强度，仍是隐患。B错误，降低起重量不能消除吊钩报废的事实。D错误，锤击矫正会破坏吊钩金属组织，且不允许对吊钩进行焊补矫正。","tier":"挑战"},{"id":99,"type":"single","stem":"某工地用汽车起重机吊装预制构件，司机发现支腿处地面在起吊过程中出现轻微下沉，此时正确的处置是","options":["立即停止起升，将吊物缓慢落回地面，重新垫实支腿后再作业","继续起升，待构件离地后快速回转避开下沉区域","保持吊物悬停，安排人员往支腿下塞木板后继续起升","加大油门快速把构件吊起，减少地面受力时间"],"answer":[0],"explanation":"知识点：支腿下沉说明地基承载不足，应立即停止起升、落回吊物并重新处理地基。A正确，停止起升、落回吊物、重新垫实是标准处置顺序。B错误，继续起升并回转会使倾覆力矩增大，可能造成整机倾翻。C错误，吊物悬停时人员钻到支腿下作业极其危险。D错误，加大油门快速起升会加剧支腿下沉和整机失稳。","tier":"挑战"},{"id":100,"type":"multi","stem":"某桥式起重机司机在吊运一捆捆扎好的钢管时，起升约半米后发现捆扎钢丝绳有滑动迹象、钢管开始轻微散开，此时下方无人员但吊物处于通道上方，正确的处置措施是？","options":["立即将主令手柄回零停止起升并保持制动","点动下降把吊物落回原地面重新捆扎","鸣铃警示并指挥地面人员从吊物下方快速通过","把吊物继续提升到安全高度再重新捆扎"],"answer":[0,1],"explanation":"本题考查吊装过程中发现吊物捆扎松动时的异常处置。知识点：吊物捆扎不牢出现散落迹象时必须停止起升、就近安全落地重新处理，不得带隐患继续作业。正确项0：发现异常首先停止起升并保持制动，防止散落扩大，正确。正确项1：点动下降将吊物落回原地面重新捆扎，是消除隐患的根本措施，正确。错误项2：吊物已在通道上方，指挥人员从下方通过属于十不吊中吊物下方有人不吊的情形，极其危险，错误。错误项3：捆扎松动时继续提升会加剧散落，且悬空重新捆扎无法实施，错误。","ti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,{"id":232,"type":"multi","stem":"起重机司机在下列哪些情况下应当拒绝起吊","options":["吊物捆绑不牢且无加固措施","吊物边缘锋利未加衬垫","指挥信号不明且无人确认","吊物重量在额定起重量以内","吊物离地后绑扎略有松动"],"answer":[0,1,2],"explanation":"知识点：十不吊内容。正确项对：捆绑不牢、锋利边未衬垫、信号不明均属十不吊范围应拒绝。错误项错在：重量在额定以内是允许起吊条件；离地后绑扎松动属起吊后发现问题应立即落钩，不是起吊前拒绝情形。","tier":"进阶"},{"id":233,"type":"single","stem":"起重机司机在吊运过程中发现吊物摆动幅度逐渐增大，正确的处置是","options":["加快运行速度冲过摆动区","立即停车待摆动减弱再运行","反向运行抵消吊物摆动","升高吊物减小摆动幅度"],"answer":[1],"explanation":"知识点：吊物摆动应停车待稳。正确项对：停车待摆动减弱再运行可防止吊物碰撞和脱钩。错误项错在：加速会加大摆动；反向运行易造成更复杂摆动；升高吊物不能减小摆动反而增加势能。","tier":"挑战"},{"id":234,"type":"single","stem":"起重机司机在作业前检查钢丝绳时，发现一个捻距内断丝数达到该绳总丝数的百分之十，正确的处置是","options":["降载百分之五十继续使用","润滑后继续观察使用","立即停止使用并更换","用绳卡连接断丝处"],"answer":[2],"explanation":"知识点：钢丝绳断丝超标应报废更换。正确项对：一个捻距内断丝达总丝数百分之十已达报废标准，应立即停用更换。错误项错在：降载使用仍存在断裂风险；润滑不能修复断丝；绳卡连接断丝处无法恢复强度。","tier":"挑战"},{"id":235,"type":"single","stem":"起重机司机在吊装作业中遇突然停电，吊物悬在空中，正确的处置是","options":["立即离开驾驶室查看情况","将控制器回零并鸣铃警示","手动松开制动器使吊物缓降","反复送电尝试恢复起升"],"answer":[1],"explanation":"知识点：突然停电应回零并警示，防止来电后设备突然动作。正确项对：控制器回零并鸣铃警示可防止复电误动作并提醒地面人员避让。错误项错在：离开驾驶室无法控制设备；手动松闸缓降无法控制速度且属违规；反复送电可能造成突然起升伤人。","tier":"挑战"},{"id":236,"type":"single","stem":"司机操作中听到地面指挥人员连续急促的哨声，但看不清其手势，此时正确的处置是","options":["按原方向继续缓慢动作等待手势明确","立即停止动作并鸣铃回应确认信号","加速完成当前动作再停车询问","凭经验判断哨声含义继续操作"],"answer":[1],"explanation":"知识点：异常信号处置原则。正确项对：连续急促哨声属紧急停止类信号，司机应立即停车并鸣铃回应，待信号明确后再动作。继续缓慢动作可能正撞向危险区；加速完成动作会扩大事故；凭经验猜测哨声违背信号不明不动作的原则。","tier":"挑战"},{"id":237,"type":"single","stem":"起重机司机在执行十不吊时，遇到吊物上站人的情况应当","options":["鸣铃警告站人者抓紧后起吊","等站人者蹲下降低重心后起吊","拒绝起吊并示意人员撤离吊物","降低起升速度缓慢将人吊离"],"answer":[2],"explanation":"知识点：十不吊中吊物上有人不吊。正确项对：吊物上站人属禁止起吊情形，必须拒绝起吊并示意人员撤离。鸣铃警告后起吊仍属带人吊运；蹲下降低重心不改变吊物上有人这一禁止条件；缓慢吊离同样违反规定且一旦坠落后果严重。","tier":"挑战"},{"id":238,"type":"single","stem":"司机在起升过程中发现钢丝绳突然抖动并伴有异常响声，首先应当","options":["立即停车落钩检查钢丝绳状况","加快起升使抖动尽快过去","维持原速观察抖动是否消失","切换慢速档继续完成起升"],"answer":[0],"explanation":"知识点：钢丝绳异常抖动可能预示断丝、卡绳或缠绕故障。正确项对：立即停车落钩检查，防止断绳坠落。加快起升会加剧钢丝绳受力；维持原速观察可能错过处置时机；切换慢速档仍带载运行，不能排除隐患。","tier":"挑战"},{"id":239,"type":"single","stem":"起重机司机在吊运熔化金属时，起升机构应采用的作业方式是","options":["先快速起升再慢速就位","先慢速起升再快速就位","起升和运行均用慢速档","起升用中速、运行用快速"],"answer":[2],"explanation":"知识点：吊运熔化金属属危险作业，要求稳、准、慢。正确项对：起升和运行均用慢速档，减小摆动和冲击，防止液体飞溅。先快后慢或先慢后快都会在某一阶段产生较大惯性；中速起升、快速运行同样会加剧摆动和洒落风险。","tier":"基础"},{"id":240,"type":"single","stem":"起重机司机在作业中突遇大风，吊物在空中摆动加剧且难以控制，正确的处置是","options":["迅速将吊物就近落地并停止作业","加速将吊物运至目标位置再停","打开回转制动让吊物随风向摆动","继续作业待风力减弱后恢复常速"],"answer":[0],"explanation":"知识点：大风工况下的应急处置。正确项对：应尽快将吊物就近安全落地并停止作业，避免失控。加速运行会加大摆动和碰撞；打开回转制动让吊物随风摆动会完全失控；继续作业并等待风力减弱属于冒险作业。","tier":"进阶"},{"id":241,"type":"single","stem":"起重机司机在起吊前发现吊钩危险断面出现塑性变形，正确的判断是","options":["变形轻微可打磨后继续使用","只要开口度未超标即可使用","该吊钩已报废不得继续使用","补焊加强后可以继续使用"],"answer":[2],"explanation":"知识点：吊钩出现塑性变形即达报废条件。正确项对：塑性变形说明材料已屈服，承载能力不可靠，必须报废。打磨、看开口度、补焊都不能恢复其力学性能，补焊还会引入热影响区缺陷。","tier":"进阶"},{"id":242,"type":"single","stem":"司机在多人指挥的吊装现场，同时看到两名人员给出方向相反的手势，应当","options":["按级别较高者的手势操作","按距离吊物较近者的手势操作","停止操作并确认唯一指挥人员","按先看到的手势完成该动作"],"answer":[2],"explanation":"知识点：起重作业只能由一名指挥人员统一指挥。正确项对：信号冲突时应停车并确认唯一指挥者。按级别、按距离、按先后都会造成误操作，且违反单指挥原则。","tier":"挑战"},{"id":243,"type":"single","stem":"起重机司机在吊运接近额定起重量的重物时，正确的做法是","options":["先试吊离地检查制动后慢速作业","直接快速起升以缩短受载时间","先将重物吊高再水平快速运送","边起升边回转以节省作业时间"],"answer":[0],"explanation":"知识点：满负荷或接近满负荷作业的稳定性要求。正确项对：先试吊离地检查制动器，确认可靠后慢速平稳作业。快速起升、吊高后快运、边起升边回转都会增大动载荷和摆动，易造成超载或失稳。","tier":"基础"},{"id":244,"type":"single","stem":"司机在操作桥式起重机时，发现大车运行机构制动器在停车后出现明显溜车，正确的处置是","options":["调整制动器弹簧后继续作业","报修并在修复合格前停用该机构","减小运行速度来弥补溜车","每次停车前提前打反车制动"],"answer":[1],"explanation":"知识点：制动器溜车说明制动力矩不足，属安全隐患。正确项对：应报修并在修复合格前停用该机构。自行调整弹簧可能改变制动力矩设定；减小速度不能消除溜车；打反车制动会冲击传动机构并可能造成溜车更严重。","tier":"挑战"},{"id":245,"type":"single","stem":"起重机司机在接班检查时发现起升高度限位器的重锤被铁丝绑扎固定在钢丝绳上，正确的处置是","options":["拆除绑扎并试验限位动作是否可靠","继续使用但本班次减少起升高度","通知维修人员后再决定是否操作","将重锤位置调整到更高处即可"],"answer":[0],"explanation":"知识点：起升高度限位器必须动作可靠，重锤自由悬垂才能触发限位。正确项对：绑扎会使限位失效，必须拆除并试验确认。A项错在减少高度并不能恢复保护功能；C项错在隐患未消除前不得带病作业；D项错在调整位置不解决绑扎导致的失效问题。","tier":"挑战"},{"id":246,"type":"single","stem":"司机操作时发现指挥信号与吊物运动方向明显不符，但信号工手势持续不停，正确做法是","options":["立即停止动作并鸣铃询问后再操作","按信号工手势继续操作","按自己判断的方向继续操作","加大起升速度尽快完成该动作"],"answer":[0],"explanation":"知识点：当信号不清或有疑问时应停止并确认。正确项对：停下并鸣铃询问可避免误操作。B项错在手势与吊物方向矛盾时盲从易造成事故；C项错在司机不得擅自改变指挥意图；D项错在加速只会放大危险。","tier":"挑战"},{"id":247,"type":"single","stem":"起重机作业中突然发生制动器打滑、吊物缓慢下滑，司机首先应采取的处置是","options":["迅速将控制器手柄回零并鸣铃警示下方人员","反复点动起升手柄试图把吊物提住","立即切断总电源让吊物自由下落","将吊物快速下降到地面再停车"],"answer":[0],"explanation":"知识点：制动失效时的第一处置是控制手柄回零、警示并疏散。正确项对：回零停止继续动作并鸣铃警示可防止事态扩大。B项错在点动会加剧下滑；C项错在断电导致失去控制；D项错在带故障快速下降更危险。","tier":"进阶"},{"id":248,"type":"single","stem":"司机在吊运熔融金属包时，对起升机构的操作要求是","options":["先低速点动试吊确认制动后再平稳起升","直接快速起升缩短高温辐射时间","起升与回转可同时进行以提高效率","吊运中允许做短距离斜拉调整位置"],"answer":[0],"explanation":"知识点：吊运熔融金属属于危险作业，需先试吊确认制动可靠。正确项对：先低速试吊再平稳起升可控制风险。B项错在快速起升易冲击和洒溅；C项错在同时动作增加失控可能；D项错在斜拉会加大摆动和脱钩风险。","tier":"基础"},{"id":249,"type":"single","stem":"司机在操作中发现起升钢丝绳在卷筒上出现乱绳、叠绕，正确的处置是","options":["停止作业将吊物落地后报告处理","继续起升让钢丝绳自行理顺","反向下降让乱绳自动解开","用手在运行中拨正钢丝绳位置"],"answer":[0],"explanation":"知识点：乱绳叠绕会导致钢丝绳损伤和排绳故障。正确项对：先落地卸载再停机报告。B项错在继续起升会挤压磨损钢丝绳；C项错在反向动作不能可靠解绳；D项错在运行中用手拨绳极易伤人。","tier":"挑战"},{"id":250,"type":"single","stem":"司机在吊物下降过程中，吊物接近地面时正确的操作方式是","options":["低速点动下降使吊物平稳就位","保持全速下降到位后再停车","先快速下降再突然反接制动","下降同时回转大车对准落点"],"answer":[0],"explanation":"知识点：吊物就位需低速平稳，避免冲击。正确项对：低速点动下降可平稳就位。B项错在全速下降冲击大；C项错在反接制动易造成溜钩或冲击；D项错在就位阶段叠加回转难以对准且危险。","tier":"基础"},{"id":251,"type":"single","stem":"司机在起吊前发现吊钩表面有裂纹但裂纹细小，正确的处置是","options":["停止使用该吊钩并报告更换","用砂纸打磨掉裂纹后继续使用","降低额定起重量一半后继续使用","在裂纹处涂漆遮盖后继续使用"],"answer":[0],"explanation":"知识点：吊钩出现裂纹必须报废更换。正确项对：停止使用并报告更换。B项错在打磨不能消除内部裂纹；C项错在降载不能修复钩体缺陷；D项错在涂漆掩盖隐患属严重违规。","tier":"挑战"},{"id":252,"type":"single","stem":"司机在操作中听到起重机金属结构发出异常声响并伴有明显振动，正确的处置是","options":["停止作业将吊物落地后检查报告","降低起升速度继续完成本次吊运","将吊物悬停在空中观察声响变化","继续操作待声响消失后恢复正常"],"answer":[0],"explanation":"知识点：异常声响振动可能预示结构或机构故障。正确项对：先落地卸载再停机检查。B项错在降速不能排除故障；C项错在悬停空中增加坠落风险；D项错在带故障继续作业可能扩大损坏。","tier":"挑战"},{"id":253,"type":"multi","stem":"起重机司机在下列情形中，属于“十不吊”范围、应当拒绝起吊的有哪些","options":["吊物上有人但已系好安全带","指挥信号不明确且无法确认","吊物埋在地下尚未挖出","超载但认为只在短距离内移动","光线不足看不清吊物和场地"],"answer":[1,2,4],"explanation":"知识点：十不吊包括信号不明、埋置物未挖出、光线不足看不清等。B项对：信号不明确不得起吊；C项对：埋置物起吊可能造成超载和结构损伤；E项对：视线不清不能保证安全。A项错在吊物上有人时即使系安全带也严禁起吊；D项错在超载不论距离长短都不得起吊。","tier":"进阶"},{"id":254,"type":"single","stem":"起重机司机在正式起吊前进行试吊时，应将重物吊离地面约多少距离停住检查制动和绑扎情况","options":["100至200毫米","500至800毫米","1000至1500毫米","2000至3000毫米"],"answer":[0],"explanation":"知识点为试吊高度要求。试吊时应将重物吊离地面100至200毫米停住，检查制动器、钢丝绳和绑扎是否可靠。500至800毫米过高，一旦溜钩冲击大；1000至1500毫米和2000至3000毫米属于正常起升高度范围，不是试吊检查高度。","tier":"基础"},{"id":255,"type":"single","stem":"司机在起吊前发现吊钩滑轮组钢丝绳有少量断丝，但未达到报废标准，此时正确的处置是","options":["照常起吊但降低额定起重量使用","记录断丝数量后按原额定起重量起吊","照常起吊并在作业结束后再报告","降低起升速度继续起吊"],"answer":[1],"explanation":"知识点为断丝未达报废标准时的处置。断丝未达报废标准时起重机仍可按额定起重量使用，但应记录并加强观察。降低额定起重量使用没有依据；作业结束后再报告会延误隐患跟踪；降低起升速度与断丝承载能力无关。","tier":"挑战"},{"id":256,"type":"single","stem":"起重机司机在作业中听到有人喊叫但听不清内容，同时看到有人朝吊物方向跑来，正确的处置是","options":["立即停车并将吊物落地","继续起吊并鸣铃警告来人","提升吊物避让来人通过","保持吊物原位等待来人说明"],"answer":[0],"explanation":"知识点为异常信号处置。听到喊叫且有人跑向吊物方向时，应视为紧急信号，立即停车并将吊物落地。继续起吊或鸣铃警告不能排除危险；提升吊物可能使人员进入更危险区域；保持吊物悬停等待会使人员处于吊物下方风险中。","tier":"进阶"},{"id":257,"type":"single","stem":"起重机司机在起吊前发现吊物重心偏向一侧，正确的处置是","options":["直接起吊并在空中调整重心","重新绑扎使吊钩对准重心上方","增加一侧起升绳长度找平","斜拉使吊物重心移到吊钩下方"],"answer":[1],"explanation":"知识点为重心与绑扎。重心偏斜时应重新绑扎，使吊钩垂线通过吊物重心。直接起吊空中调整易造成摆动和脱钩；增加一侧绳长不能解决重心偏心问题；斜拉是违规操作，可能造成超载和吊物摆动。","tier":"挑战"},{"id":258,"type":"single","stem":"起重机司机在起吊埋在地下的物件前，正确的处置是","options":["先缓慢起升试探埋设阻力","直接按额定起重量起吊","先斜拉使物件松动再起吊","先点动起升多次冲击松动"],"answer":[0],"explanation":"知识点为埋设物起吊。埋设物应先缓慢起升试探阻力，确认无卡阻后再起吊，防止超载。直接按额定起重量起吊可能超载；斜拉违规；点动冲击会加剧超载和钢丝绳冲击。","tier":"基础"},{"id":259,"type":"single","stem":"起重机司机在作业中发现制动器突然失灵，吊物无法停止下降，正确的处置是","options":["立即将控制器手柄回零并鸣铃警告","迅速反向操作使吊物上升","切断总电源让吊物自由下落","继续操作将吊物放到地面"],"answer":[0],"explanation":"知识点为制动失灵应急。制动失灵时应立即将控制器手柄回零并鸣铃警告下方人员避让。反向操作可能造成冲击和失控；切断总电源会使吊物自由坠落；继续操作无法控制下降速度。","tier":"挑战"},{"id":260,"type":"single","stem":"起重机司机在起吊过程中发现钢丝绳突然跳槽，正确的处置是","options":["立即停车并落钩后处理","继续起吊到终点再处理","反向操作使钢丝绳回槽","加速起升让钢丝绳自行复位"],"answer":[0],"explanation":"知识点为钢丝绳跳槽处置。钢丝绳跳槽应立即停车并落钩后处理。继续起吊会加剧磨损和断丝；反向操作可能使跳槽更严重；加速起升不能使钢丝绳复位且危险。","tier":"挑战"},{"id":261,"type":"single","stem":"起重机司机在作业中需要临时离开操作室时，正确的处置是","options":["将吊物悬停在空中并锁好控制器","将吊物落地切断电源并锁好控制器","将吊物悬停并请人看管控制器","将吊物落地但不切断电源"],"answer":[1],"explanation":"知识点为司机离岗处置。司机离开操作室应将吊物落地、切断电源并锁好控制器。吊物悬停空中存在坠落风险；请人看管不能替代司机职责；不切断电源可能被误操作。","tier":"进阶"},{"id":262,"type":"single","stem":"起重机司机在起吊前发现吊索具标注额定起重量为2吨，而吊物实际重量约2.5吨，正确的处置是","options":["直接起吊并降低起升速度","换用额定起重量足够的吊索具","增加吊索数量后起吊","斜拉吊物减轻吊索受力"],"answer":[1],"explanation":"知识点为吊索具额定起重量。吊索具额定起重量小于吊物重量时必须更换足够额定起重量的吊索具。降低起升速度不能改变超载；增加吊索数量若未重新核算受力仍可能超载；斜拉违规且不能减轻吊索受力。","tier":"挑战"},{"id":263,"type":"single","stem":"起重机作业中，司机听到有人喊“停车”但看不清喊话人位置时，正确的处置是","options":["立即停车并鸣铃警示","继续作业同时探头查看","减速观望确认后再决定","按指挥信号继续操作"],"answer":[0],"explanation":"知识点：异常信号处置。起重作业中任何人发出的停车信号，司机都应立即执行，停车并鸣铃警示是标准处置。继续作业或探头查看会延误制动时机；减速观望仍带载移动存在风险；按原指挥信号继续操作违反了“任何人停车信号均须执行”的原则。","tier":"进阶"},{"id":264,"type":"single","stem":"起重机司机在吊运熔融金属时，起升机构应采用的操纵方式是","options":["先低速点动再逐级提速","直接推到最高速挡","用反接制动快速停稳","连续起停控制下落速度"],"answer":[0],"explanation":"知识点：特殊吊运操作。吊运熔融金属要求平稳，先低速点动确认制动正常再逐级提速，避免冲击。直接推最高速挡会产生冲击载荷；反接制动用于快速停车会加剧冲击；连续起停控制下落会使吊物抖动，均不符合熔融金属吊运平稳要求。","tier":"基础"},{"id":265,"type":"single","stem":"起重机司机在作业中发现制动器出现轻微打滑，正确的处置是","options":["停止作业并报告检查制动器","降低起升速度继续完成当前吊次","改为点动操作控制下滑","加重配重后继续作业"],"answer":[0],"explanation":"知识点：制动器异常处置。制动器打滑说明制动力矩不足，必须停止作业、报告并检查。降低速度或点动操作只是掩盖问题，不能消除制动失效风险；加重配重与制动器打滑无关，属于错误处置。","tier":"挑战"},{"id":266,"type":"single","stem":"起重机司机在吊物下降过程中，发现吊物晃动幅度增大，应优先采取的措施是","options":["停止下降待晃动减小后再继续","加快下降速度缩短晃动时间","反向点动抵消晃动方向","继续下降同时用绳索牵引"],"answer":[0],"explanation":"知识点：吊物晃动处置。晃动增大时应停止下降，待摆动衰减后再继续，防止吊物碰撞或脱钩。加快下降会加剧摆动；反向点动容易造成冲击和二次摆动；继续下降同时牵引属于边晃边落，风险未消除。","tier":"进阶"},{"id":267,"type":"single","stem":"起重机司机在交接班时，发现上一班记录的“起升高度限位器动作正常”与现场试验结果不符，应","options":["停止使用该起重机并报告处理","按上一班记录继续使用","自行调整限位器后使用","在记录上注明差异即可使用"],"answer":[0],"explanation":"知识点：安全装置交接与处置。限位器试验结果与记录不符，说明安全装置可能失效，必须停用并报告。按记录继续使用、自行调整、仅注明差异后使用均未消除限位失效隐患，不符合安全装置不得带病运行的要求。","tier":"进阶"},{"id":268,"type":"single","stem":"起重机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:"制动器失灵时，应迅速将控制器回零、鸣笛示警并采取紧急措施控制现场。加大起升速度、反复点动都不能有效制动；切断总电源可能使吊物失控下坠。","tier":"进阶"},{"id":288,"type":"single","stem":"起重机司机在大风天气作业，当风力达到使吊物明显飘移时，正确的处置是","options":["降低起升高度继续作业","停止作业并将吊物落至地面","加快动作缩短作业时间","增加配重后继续作业"],"answer":[1],"explanation":"大风使吊物飘移时已不具备安全作业条件，应停止作业并把吊物落至地面。降低高度、加快动作、增加配重都不能消除风载带来的失稳风险。","tier":"进阶"},{"id":289,"type":"single","stem":"起重机司机在吊运液态金属或危险物品前，除正常检查外还应重点确认的是","options":["吊物重量是否超过额定起重量","吊运路线上是否有人通行","专用吊具和包吊是否牢靠","操作室空调是否正常"],"answer":[2],"explanation":"吊运液态金属等危险物品时，专用吊具和包吊的可靠性是关键风险点。重量、路线人员、空调虽也需关注，但不是该类吊运最核心的专项确认内容。","tier":"基础"},{"id":290,"type":"single","stem":"起重机司机在正式起吊前进行试吊时，正确的操作程序是","options":["将吊物吊离地面约200毫米后停车检查，确认制动和绑扎可靠后再继续起升","将吊物快速吊至一人高后立即回转，观察吊物摆动情况判断稳定性","将吊物吊离地面约2米后停车，用对讲机通知指挥人员确认后再起升","将吊物吊离地面约500毫米后不停车直接起升，边起升边检查绑扎"],"answer":[0],"explanation":"知识点：试吊程序要求将吊物吊离地面约200毫米停车检查制动器、钢丝绳和绑扎情况。正确项符合试吊的'离地停检'要求；快速吊至一人高回转是凭摆动判断稳定性，忽略了制动检查；吊离2米已超过试吊高度且依赖对讲机确认，本末倒置；不停车直接起升无法发现制动和绑扎隐患。","tier":"基础"},{"id":291,"type":"single","stem":"起吊作业中司机听到指挥人员发出连续急促的哨声，但看不清手势，此时正确的处置是","options":["立即停止起升动作并鸣铃回应，等看清手势或听到明确指令后再操作","按原方向继续缓慢起升，同时鸣铃提醒周围人员注意避让","立即将吊物快速下降到地面，再停机等待指挥人员重新指挥","保持当前状态不动并持续鸣铃，直到指挥人员走近驾驶室说明"],"answer":[0],"explanation":"知识点：指挥信号不清或异常时司机应停止动作并鸣铃回应，确认信号后再操作。正确项先停止再确认，符合'信号不明不动作'；继续缓慢起升属于带着疑问作业，风险未消除；快速下降可能造成吊物冲击或碰撞；保持不动且持续鸣铃不主动确认，不能恢复作业。","tier":"挑战"},{"id":292,"type":"single","stem":"起重机司机在执行'十不吊'时，对吊物上站人的情形应","options":["拒绝起吊，待人员撤离吊物并确认安全后再进行起吊","起吊前鸣铃示意吊物上人员蹲下抓牢后缓慢起吊","降低起升速度并安排专人在旁监护，将吊物短距离转移","起吊前要求吊物上人员系好安全带后按原计划起吊"],"answer":[0],"explanation":"知识点：十不吊明确规定吊物上有人不吊。正确项坚持人员撤离后再吊；鸣铃让人员蹲下抓牢仍属带人起吊；安排监护并短距离转移不能消除人员坠落风险；系安全带也不能替代人员撤离吊物。","tier":"基础"},{"id":293,"type":"single","stem":"起重机司机在作业中突然发现起升机构制动器失灵，吊物有下滑趋势，正确的紧急处置是","options":["立即将控制器手柄回零并反接制动，同时发出警示信号","立即将控制器手柄推向下降方向，让吊物快速落到地面","保持起升状态并切断总电源，等待吊物自然停住后再处理","立即松开制动器让吊物自由下滑，避免制动器进一步损坏"],"answer":[0],"explanation":"知识点：制动器失灵时应回零并采取反接制动等紧急措施，同时警示。正确项利用反接制动抑制下滑；推向下降方向会加速吊物坠落；断电等待会让吊物失控下滑；松开制动器更是直接放弃制动，后果严重。","tier":"挑战"},{"id":294,"type":"single","stem":"起重机司机在起吊前对吊钩进行检查时，发现吊钩危险断面磨损达到原尺寸的12%，正确的判断是","options":["吊钩已超过报废标准，不能继续使用，应更换吊钩","磨损未超过15%，可以继续使用但需缩短检查周期","磨损未超过20%，可以继续使用并做好记录","吊钩磨损属于正常现象，只要无裂纹即可继续使用"],"answer":[0],"explanation":"知识点：吊钩危险断面磨损达原尺寸10%即应报废。正确项按10%标准判定报废；15%和20%都超过了报废限值却说可用，是错误的放宽；无裂纹即可用忽略了磨损量的独立报废要求。","tier":"挑战"},{"id":295,"type":"single","stem":"起重机司机在作业中发现起升钢丝绳出现轻微扭结，但尚未断丝，正确的处置是","options":["停止使用该钢丝绳，报告并更换后再继续作业","降低起升高度限制，避开扭结段继续完成当班作业","在扭结处加装绳卡固定后继续使用","将扭结段绕到卷筒上避开受力，继续正常作业"],"answer":[0],"explanation":"知识点：钢丝绳扭结属于严重缺陷，应停用更换。正确项停止使用并更换；限制高度继续使用仍让扭结段受力；加绳卡不能恢复钢丝绳承载能力；绕到卷筒上避开受力是掩耳盗铃，扭结仍存在。","tier":"挑战"},{"id":296,"type":"single","stem":"起重机司机在作业结束后，将吊钩升至接近上限位置并停放在规定位置的目的是","options":["防止吊钩在风力或碰撞下摆动伤人，并避免钢丝绳长期受力","使钢丝绳保持张紧状态，防止卷筒上的钢丝绳松散","便于下一班司机直接起吊，减少准备时间","让制动器处于松开状态，延长制动器使用寿命"],"answer":[0],"explanation":"知识点：作业结束后吊钩应升至接近上限并停放规定位置。正确项说明防摆防撞和避免钢丝绳长期受力；保持张紧与停放目的相反；便于下一班不是安全停放的主要目的；制动器松开并非该操作目的。","tier":"进阶"},{"id":297,"type":"single","stem":"塔式起重机吊运散装物料时突遇六级大风，司机正确的处置是","options":["立即将吊物就近落地，切断电源并撤离驾驶室","将吊物提升过障碍物后快速转到安全区域落钩","保持吊物悬停等待风向稳定后继续作业","将回转机构松开制动让其随风自由回转"],"answer":[0],"explanation":"知识点：大风天气起重机作业处置。正确项：六级及以上大风应停止作业，将吊物就近安全落地、切断电源并撤离，防止吊物摆动失控。错误项：后三项分别错在带载冒险转移、悬停等待使吊物长时间受风摆威胁、松开回转制动会造成吊臂自由回转失控。","tier":"进阶"},{"id":298,"type":"single","stem":"起重机起吊前进行试吊时，将吊物吊离地面约多少高度后应暂停检查制动和绑扎情况","options":["100毫米左右","500毫米左右","1000毫米左右","2000毫米左右"],"answer":[1],"explanation":"知识点：试吊操作要点。正确项：试吊时将吊物吊离地面约500毫米停住，检查制动器、钢丝绳受力及绑扎是否可靠。错误项：100毫米过低不便观察绑扎与受力；1000毫米和2000毫米过高，一旦制动失效或绑扎滑脱，冲击和摆动风险明显增大。","tier":"基础"},{"id":299,"type":"single","stem":"司机在吊运过程中发现起升机构制动器出现连续打滑，正确的下一步处置是","options":["将吊物缓慢落到安全位置后停机报修","改用手动控制点动起升把吊物送到位","降低起升速度继续完成本次吊运","加大起升电机功率补偿制动力不足"],"answer":[0],"explanation":"知识点：制动器异常时的应急处置。正确项：制动器打滑属失控风险，应先将吊物稳妥落地再停机报修，避免带载继续运行。错误项：点动起升仍依赖同一失效制动器；降低速度不能恢复制动力；加大功率更会加剧失控，均属带病作业。","tier":"进阶"},{"id":300,"type":"multi","stem":"下列情形中，起重机司机应当拒绝起吊的有","options":["吊物捆扎不牢且棱角处未加衬垫","指挥信号来自佩戴标志的专职指挥人员","吊物上站人且无人负责其安全","起吊现场光线不足看不清指挥手势","吊物重量在额定起重量范围内且绑扎可靠"],"answer":[0,2,3],"explanation":"知识点：起重机“十不吊”内容。正确项：捆扎不牢或棱角无衬垫、吊物上站人、光线不足看不清指挥信号，均属禁止起吊情形。错误项：佩戴标志的专职指挥人员发出的信号属正常指挥；吊物在额定起重量内且绑扎可靠属正常可吊工况，均不应拒绝。","tier":"进阶"}]}