当三相交流发电机的三个绕组接成星形时，若线电压，则相电压=（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69389' and id < 4493000 and id<>'4493000' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69389' and id > 4493000 and id<>'4493000' order by id asc limit 5