下列哪种物质可减小气道阻力？（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30913' and id < 2487666 and id<>'2487666' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30913' and id > 2487666 and id<>'2487666' order by id asc limit 5