理想电流源的电流为定值，电压电流取非关联参考方向，则电压可以为（  　），由外电路决定。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68472' and id < 4420936 and id<>'4420936' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68472' and id > 4420936 and id<>'4420936' order by id asc limit 5