当量直径<（）mm的土壤孔隙称为非活性孔隙
A.0.02
B.0.02--0.002
C.0.002
D.0.001
参考答案：C
Because of the heavy traffic, it was already time for lunch break （） she got to her offiee.
A. since
B. that
C. when
D. until
为人师表的具体要求有哪些？
