题目内容
下列关于通气/血流比值的叙述,正确的是( )
2021-10-17
A.指肺通气量和肺血流量的比值
B.人体直立时,肺尖部的比值减小
C.比值增大意味着肺泡无效腔减小
D.比值无论增大或减小,都不利于肺换气
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