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解析: 見Mosby';s Respir☆☆☆☆☆ ...
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Mosby's Respiratory Care Equipment 9th, P.244圖A Fleisch pneumotachograph為單向氣流圖B screen(silverman)pneumotachograph為雙向氣流圖C Variable orifice為雙向氣流圖D Vortex ultrasonic為單向氣流