.图示对称三相电路中，已知电源线电压为380V。图中电压表内阻可视作无穷大则此时电压表读数为（   ）    

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69505' and id < 4502639 and id<>'4502639' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69505' and id > 4502639 and id<>'4502639' order by id asc limit 5