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on：and from：and and；to from；to
was held was holding will be held will be holding
was held was holding will be held will be holding
where sit the European leaders the European leaders there sit sit the European leaders that the European leaders sit
where sit the European leaders the European leaders there sit sit the European leaders that the European leaders sit
Pa＞PA＞Pv Pa＞Pv＞PA 肺内压（PA）＞肺血管动脉端压力（Pa）＞肺血管静脉端压力（Pv） Pv＞PA＞Pa Pv＞Pa＞PA
was held was holding will be held will be holding
p≤500Pa、500Pa＜p≤1500Pa、p＞1500Pa p≤50Pa、50Pa＜p≤500Pa、p＞500Pa p≤50Pa、50Pa＜p≤250Pa、p＞250Pa p≤500Pa、500Pa＜p≤1000Pa、p＞1000Pa
400Pa-600Pa 1000Pa-2000Pa 2000Pa-3000Pa 4000Pa-6000Pa
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