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
单项选择题 In a modern three-phase A-Csynchronous brushless generator, the excitation winding is on the rotorThat means （）.
单项选择题 Ammeter is to measure the （）.
单项选择题 The starting current of an a-cmotor is （） the rated current.
