气体的摩尔定压热容大于摩尔定容热容Ce，其主要原因是（）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30391' and id < 2456857 and id<>'2456857' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30391' and id > 2456857 and id<>'2456857' order by id asc limit 5