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英语难理解Thecontactscouldbenormallyopenandareclosedbyelectromagneticaction,or,viceversa,thecontactscouldbenormallyclosedandareopenedbyelectromagneticaction.

题目详情
英语难理解
The contacts could be normally open and are closed by electromagnetic action,or,vice versa,the contacts could be normally closed and are opened by electromagnetic action.
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答案和解析
触体可以通过电磁作用打开或关闭