同步发电机带感性负载时，空载电动势（   ）端电压有效值。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69444' and id < 4497175 and id<>'4497175' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69444' and id > 4497175 and id<>'4497175' order by id asc limit 5