与NO3-互为等电子体的是[ ]
A.SO3
B.BF3
C.CH4
D.NO2
答案:B
短文填空,每空一词(10分)
This 小题1: my room. My TV is on the desk. My jacket is on 小题2: bed. The notebook is on the bed, too. The keys 小题3: in the drawer and my ID 小题4: is on the table. My room is nice and 小题5: like (喜欢) it very much.
工程地质勘察是为了查明建设地区的工程地质条件,提出建设场地( )和地基承载能力的正确评价而进行的工作。
A.安全性B.稳定性C.简单性D.复杂性