單項(xiàng)選擇題The separate supplies are connected in either star or delta formationThe star formation is most commonly used and requires（） slip-rings on the alternator.
A.two
B.three
C.four
D.five
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1.單項(xiàng)選擇題After a ship enters service it is（） for the main bus-bar to be made dead.
A.usually
B.commonly
C.exceptional
D.unavoidably
2.單項(xiàng)選擇題（） is a machine by which electrical energy is transformed into mechanical energy.
A.An alternator
B.An electric motor
C.A diesel engine
D.A main switchboard
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