正确答案: C

throughout

题目：Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead, it therefore follows that the bus-bars are continuously alive the life of the ship.

解析：C

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举一反三的答案和解析：

[单选题]寻找水的不正确方法：

发现昆虫

[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