换热器中折流板常规形状有：单弓形、双弓形、三弓形及圆盘-圆环形。 （ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24912' and id < 2125291 and id<>'2125291' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24912' and id > 2125291 and id<>'2125291' order by id asc limit 5