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名词解释题
英译汉：contactor
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单选题The overcurrent relay （） the motor contactor when the motor exceeds its rated current.A
connectsB
tripsC
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单选题Which of the following statements represents the main difference between a relay and a contactor?（）A
Contactors control current and relays control voltageB
A relay is series connected and a contactor is parallel connectedC
Contactors can handle heavier loads than relaysD
Contactors are made from silver and relays are made from copper
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