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='69474' and id < 4499591 and id<>'4499591' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69474' and id > 4499591 and id<>'4499591' order by id asc limit 5