由气体各部分发生相对位移将热量带走的过程，称为（）。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69241' and id < 4483389 and id<>'4483389' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69241' and id > 4483389 and id<>'4483389' order by id asc limit 5