下述哪项体征最有助于鉴别胸腔积液和肺不张(    )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26327' and id < 2201077 and id<>'2201077' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26327' and id > 2201077 and id<>'2201077' order by id asc limit 5