41.正常情況下,肺泡通氣量(alveolar ventilation)約占總通氣量(total minute ventilation)的多少%?
(A)20~30
(B)30~40
(C)50~60
(D)60~70
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統計: A(38), B(84), C(123), D(383), E(0) #2180615
統計: A(38), B(84), C(123), D(383), E(0) #2180615