用价层电子对互斥理论判断SO3的分子构型 [ ]
A.正四面体形
B.V形
C.三角锥形
D.平面三角形
答案:D
毒性大,仅局部应用的抗病毒药()
A.阿昔洛韦
B.利巴韦林
C.阿糖腺苷
D.碘苷
E.金刚烷胺
The port gang way caught on a()on the wharf and was severely damaged.
A.bollard
B.bitt
C.stem
D.keel