当恒流源开路时，该恒流源内部有电流，有功率损耗。()（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id < 4494957 and id<>'4494957' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id > 4494957 and id<>'4494957' order by id asc limit 5