题目内容

驾驶舱的门锁是()

A. 机械锁
B. 电磁锁
C. 没有锁
D. 密码锁

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尾水隧洞充水前应该检查哪些条件()

A. 尾闸及旁通阀关闭;
B. 球阀关闭;
C. 蜗壳及尾水进人孔关闭。

在投保手续方面与之前有什么较大的变化?

While you are at anchor,what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position().

A decreasing reading on loran pair 9960-X
B. The bearing of Wolf Trap Light changing to the right
C. Increasing soundings
D. The bearing of Wolf Trap Light changing to the left

在中性点不接地的低压供电系统中,起重机的金属(或大车轨道)应采取()。

A. 接地保护
B. 接零保护
C. 失磁保护

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