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【单选题】
某人的肺通气量为7500ml/min,呼吸频率为20次/min,无效腔气量为125ml, 每分心输出量为5000ml时,其通气/血流比值是A.
0.7
B.
0.8
C.
0.9
D.
1.0
E.
1.1
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