对称星形负载接于线电压为380V的三相四线制电源上,如下图所示。当M点和D点同时断开时,U1为( )。
发布时间:2026-01-23
A.220V
B.380V
C.190V C.110V
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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id < 4499927 and id<>'4499927' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id > 4499927 and id<>'4499927' order by id asc limit 5
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