电流的大小用电流强度来表示，其数值等于单位时间内穿过导体横截面的（   ）代数和。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id < 4499893 and id<>'4499893' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id > 4499893 and id<>'4499893' order by id asc limit 5