下图所示对称三相电路中，若，则A相负载的相电压=（   ）。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69389' and id < 4493024 and id<>'4493024' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69389' and id > 4493024 and id<>'4493024' order by id asc limit 5