31.某成年患者被送至急診室,在呼吸空氣下,pH:7.08,PCO2 :80 mm Hg,PO2 :40 mm Hg, HCO3 - :22,SaO2 :75%,則arterial hypoxemia之機制為:
(A)Ventilation in excess of perfusion
(B)Perfusion in excess of ventilation
(C)Alveolar shunt
(D)Hypoventilation
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統計: A(7), B(9), C(16), D(57), E(0) #1059346
統計: A(7), B(9), C(16), D(57), E(0) #1059346