当电动机从空载到负载运行时，（   ）和（   ）基本不变，（   ）随负载大小而变化。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id < 4497280 and id<>'4497280' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id > 4497280 and id<>'4497280' order by id asc limit 5