理想电流源的电流为定值，电压为（  　），且由外电路决定．

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id < 4420821 and id<>'4420821' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id > 4420821 and id<>'4420821' order by id asc limit 5