题目内容

柴油发电机组常用的配电方案主要有( )。

A. 一种
B. 两种
C. 三种
D. 四种

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碱性镉镍蓄电池安装前应将槽体擦拭干净。安装在台架上的电池要排列整齐，两电池间的距离不( )，并应注意相邻电池正负极交替的正确性。

A. 大于25mm
B. 小于25mm
C. 大于50mm
D. 小于50mm

发电机组至低压配电柜馈电线路的相间以及相对地间的绝缘电阻值应大于0.5MΩ；塑料绝缘电缆馈电线路直流耐压试验为2.4kV，时间( )，泄漏电流稳定，无击穿现象。

A. 8min
B. 10min
C. 12min
D. 15min

The fellow is very ______ . He never asks others for advice.

A. conceited
B. proud
C. thoughtful
D. selfish

The traffic was very heavy~ otherwise I ______ here 50 minutes sooner.

A. would be
B. should be
C. would have been
D. had been