How are you?[ ]
A. How are you?
B. Fine, thank you.
答案:B
—What were you doing _____ it was raining?
—I was getting out of the library.[ ]
A. when
B. if
C. while
D. as
含水层的导水系数T,可以反应()。
A.含水层的透水能力
B.含水层的厚度
C.含水层的出水能力
D.含水层通过水的能力