题目内容

THDS开机磁钢电缆须敷设地下()电缆。

A. 信号
B. 双绞
C. 铠装
D. 通信

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在《电业生产事故调查规程》中,从事与电力生产有关工作的职工是指由企业支付工资的各种用工形式的职工,包括()。

A. 合同制职工;
B. 临时工;
C. 临时农民工;
D. 固定职工。

关于焊料的特性,说法正确的是()

A. 相同直径的焊锡丝,熔点相同
B. 含锡量较大的焊料,其导电性较好
C. 含锡量较小的焊料,其导电性较好
D. 焊料的导电率高于银制材料

逆流式换热器与顺流式换热器比较,有何优点?

The bilge system has been performing well; however, the aft starboard engine room bilgewell suddenly fails to be pumped outWhich of the following should be done first to determine the cause?()

A. Open the bilge pump for inspection
B. Remove each of the manifold valves
C. Remove only the manifold valve to the affected bilge-well
D. Attempt to pump out another bilge well to determine if the entire system is affected

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