换热器中的换热管积垢会导致（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='24912' and id < 2125264 and id<>'2125264' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24912' and id > 2125264 and id<>'2125264' order by id asc limit 5