励磁电流小于正常励磁值（欠励）时，同步电动机相当于（    ）负载。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68477' and id < 4421342 and id<>'4421342' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68477' and id > 4421342 and id<>'4421342' order by id asc limit 5