【单选题】
____工作前向工作班全体成员进行安全交底，并要求工作班成员严格执行工作票所列安全措施和风险控制措施。___
A. 工作监护人
B. 工作签发人
C. 工作许可人
D. 工作负责人
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____负责正确完成工作票所列安全措施的操作，并检查工作范围与运行设备是否有效隔离，设备设施是否有突然来气、来电等危险。___
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所有工作开始前，工作负责人应向工作班全体成员进行____，内容包括（但不限于）工作内容、工作范围、质量要求和职责分工以及风险控制、应急措施___
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【单选题】
正确完成工作票所列安全措施的操作，并检查工作范围与运行设备是否有效隔离，设备设施是否有突然来气、来电等危险，是____的安全职责___
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动火点在已投运天然气管道、站场（阀室）输气设施本体及附属工艺设备上，不能有效隔离但能置换合格的管道打开或连头动火作业，属于_______
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