单项选择题
The overcurrent relay （） the motor contactor when the motor exceeds its rated current.
A.connects
B.trips
C.fouls
D.destructs
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相关考题
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In a modern three-phase A-Csynchronous brushless generator, the excitation winding is on the rotorThat means （）.
A.The generator needs not excitation
B.The winding on the rotor is for inputting excitation current
C.There are three phase windings on the rotor
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