图2-27所示电路中，U=0时，I= -6A,则U=18V时，，电流I值为（ 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30079' and id < 2435271 and id<>'2435271' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30079' and id > 2435271 and id<>'2435271' order by id asc limit 5