为保证三相电路正常工作,防止事故发生,在三相四线制中,规定不允许安装熔断器或开关的位置是( )。
发布时间:2026-01-23
A.端线
B.中线
C.端点
D.中点
试卷相关题目
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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69476' and id < 4499755 and id<>'4499755' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69476' and id > 4499755 and id<>'4499755' order by id asc limit 5
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