固定管板式换热器在壳体上设置膨胀节是为了（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24912' and id < 2125272 and id<>'2125272' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24912' and id > 2125272 and id<>'2125272' order by id asc limit 5