试题与答案

电磁抱闸机械制动装置在起重机械中被广泛应用。这种机械制动装置不但可以实现准确定位,而

题型:判断题

题目:

电磁抱闸机械制动装置在起重机械中被广泛应用。这种机械制动装置不但可以实现准确定位,而且在电动机突然断电时,可以避免自行坠落所导致的事故发生。

答案:

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A. in a store window
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D. on a company notice-board
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