【单选题】
事故调查期限自事故发生之日起计算特别重大事故的调查期限为___。
A. 45日
B. 50日
C. 55日
D. 60日
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答案
D
解析
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间接带电作业当受限制时，作业人员(包括其所携带的非绝缘工具、材料)与带电体之间须保持的最小距离不得小于___。
A. 2 000 mm
B. 1 500 mm
C. 1 000 mm
D. 600 mm
【单选题】
《接触网安全工作规程》中接触网的步行巡视工作要求叙述错误的是：___。
A. 巡视不少于两人，其安全等级不低于三级
B. 巡视人员应戴安全帽，穿防护服，携带望远镜和通信工具
C. 任何情况下巡视，对接触网都必须以有电对待
D. 夜间巡视还要有照明用具
【单选题】
《接触网安全工作规程》中接触网的步行巡视工作要求叙述错误的是：___。
A. 在160 km/h～200 km/h区段巡视时，应事先告知供电调度，并在车站设置行车防护
B. 在200 km/h以上区段，一般不进行步行巡视
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D. 巡视人员不得攀登支柱并时刻注意避让列车
【单选题】
因事故死亡、重伤人数___内发生变化，导致事故等级变化的，相应改变事故等级。事故报告后，人员伤亡、脱轨辆数、设备损坏等情况发生变化时，应及时补报。
A. 2日
B. 3日
C. 5日
D. 7日
【单选题】
发票人签发工作票时，要做好___事项。
A. 所安排的作业项目是必要和可能的
B. 所采取的安全措施是正确和完备的
C. 所配备的工作领导人和作业组成员的人数和条件符合规定
D. 以上均是
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