试题与答案

在整个呼吸周期中正常吸气占多少比例() A.3/4 B.2/3 C.1/2 D.1/

题型:单项选择题

题目:

在整个呼吸周期中正常吸气占多少比例()

A.3/4

B.2/3

C.1/2

D.1/3

E.2/5

答案:

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