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單項(xiàng)選擇題

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

A.one
B.less than one
C.more than one
D.negative one

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單項(xiàng)選擇題

The alternating current generator supplying a load has a voltage drop resulted from the loadWhen the load has a lagging power factor this voltage drop （）.

A.is small
B.may be neglected
C.is useful
D.is considerable

單項(xiàng)選擇題

After the trouble of the automatic control system has been completely eliminated, assistance is （） required.

A.remained
B.still
C.no longer
D.much mere

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