通常在90千米高度以下,可将干空气作为单一成分的理想气体处理,其平均分子量为()。
A.16摩尔
B.18摩尔
C.29摩尔
D.32摩尔
参考答案:C
我国资本主义萌芽最早出现在[ ]
A.唐朝
B.宋朝
C.元朝
D.明朝
---Your sister nearly _______ all her spare time to her study during the three years.
----That's right, or she ________ the first place in her school in the College Entrance Examination.
A.devoted; wouldn't have taken
B.spent; wouldn't have taken
C.had devoted; hadn't taken
D.had spent; couldn't take