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單項(xiàng)選擇題

A fuse that blows often should be replaced only with a fuse of （）.

A.the recommended current and voltage rating
B.higher current and voltage rating
C.higher current and lower voltage rating
D.lower current and higher voltage rating

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A constant output voltage from an AC generator is maintained by the （）.

A.prime mover governor
B.exciter generator
C.voltage regulator
D.reverse power relay

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What type of rotor is used in split-phase motors?（）

A.Dram
B.Salient pole
C.Squirrel-cage
D.Wound-rotor