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单选题
After resolving the trouble of main power supply, main switch of emergency generator should（）, if power supply is refreshed.
A
be switched off by the duty officer
B
be switched on by the duty officer
C
be switched off automatically
D
be switched on automatically
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单选题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.A
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单选题（） is (are) not power supplied by main switchboard directly.A
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