维持胸膜腔内负压的必要条件是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30915' and id < 2487834 and id<>'2487834' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30915' and id > 2487834 and id<>'2487834' order by id asc limit 5