习惯上把负电荷运动方向规定为电流的方向。（）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='32669' and id < 2598614 and id<>'2598614' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32669' and id > 2598614 and id<>'2598614' order by id asc limit 5