單項選擇題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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1.單項選擇題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
2.單項選擇題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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