肺动脉干起始的部位是（）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28789' and id < 2351696 and id<>'2351696' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28789' and id > 2351696 and id<>'2351696' order by id asc limit 5