试题与答案

一般人的呼吸差为(),经常锻炼的人的呼吸差为()A.3-4cn;10-12cm B.

题型:单项选择题

题目:

一般人的呼吸差为(),经常锻炼的人的呼吸差为()

A.3-4cn;10-12cm

B.5-8cn;9-16cm

C.5-8cn;10cm

D.3-4cn;20cm以上

答案:

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