对线性电阻，当电阻为无穷大时（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69470' and id < 4499540 and id<>'4499540' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69470' and id > 4499540 and id<>'4499540' order by id asc limit 5