泡沫灭火系统中应每（ ）对消防泵和备用动力进行一次启动试验。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29272' and id < 2383453 and id<>'2383453' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29272' and id > 2383453 and id<>'2383453' order by id asc limit 5