單項(xiàng)選擇題

With a purely （） load the voltage and current are in phase, giving a power factor of one.

A.inductive
B.resistance
C.combined
D.capacitate

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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

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

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