螺杆泵井施工中插接杆的丈量以及双向油管锚下井时的注意事项有哪些?
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检修发电机、同期调相机和高压电动机应填用变电站(发电厂)()工作票。
The Ship Security Plan should indicate the operational and physical () the ship itself should take to ensure it always operates at security level 1.
A. precaution measures
B. safety measures
C. security measures
D. emergency response measure
安全管理的基本原则安全第一、预防为主。
A. 正确
B. 错误