换热器腐蚀的主要部位是换热管、管子管板接头、壳体、管子与折流板交界等处。（） 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24910' and id < 2125215 and id<>'2125215' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24910' and id > 2125215 and id<>'2125215' order by id asc limit 5