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单选题
An indicator on the main switchboard should show （） the emergency battery is in service or not.
A
that
B
when
C
if
D
whether
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Ammeter and changeover switchB
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单选题（）are located on the road panel of main switchboard.A
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单选题（） is a machine by which electrical energy is transformed into mechanical energy.A
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BusbarB
Load panel of main generatorC
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Deck machineryB
Little power loadC
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单选题（） is (are) not power supplied by main switchboard directly.A
Steering gear and windlassB
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CO2B
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