Instead of you ___ on me. I should wait on you.
A.wait
B.waited
C.waiting
D.be waited
答案:C
某场地地表土挖去4m,则该场地土成为()。
A.超固结土
B.欠固结土
C.正常固结土
D.弱欠固结土
简述我国卫生法的渊源。