正确答案: C

exceptional

题目：After a ship enters service it is_____for the main bus-bar to be made dead

解析：C

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举一反三的答案和解析：

[单选题]If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in _____.

the crankcase explosion

[单选题]下列说法错误的是：_______。

油轮油舱着火最好用二氧化碳扑灭。