单选题After resolving the trouble of main power supply, main switch of emergency generator should（）, if power supply is refreshed.Abe switched off by the duty officerBbe switched on by the duty officerCbe switched off automaticallyDbe switched on automatically
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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