经面罩双水平正压通气治疗慢性阻塞性肺病合并呼吸衰竭的疗效观察
경면조쌍수평정압통기치료만성조새성폐병합병호흡쇠갈적료효관찰
Observation of the effect of Bi-level positive airway pressure to treat COPD to amalgamate breath horizontally by the face guard mask
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