用双线桥标出以下方程式中元素化合价变化、电子转移及数目并指出氧化剂还原剂。
(1)4Al + 3O2 ="=" 2Al2O3 (2)2H2O2 ="== " 2H2O + O2↑
略
选用括号内所给单词的适当形式填空。
1. Turn right on _____________ Avenue and the zoo is on your left. (nine)
2. Tom is _____________ on the beach now. He is very relaxed. (lie)
3. Mary's mother works ill a police station, she is a _____________. (police)
4. Please write to me and tell me about _____________ (you)
5. It's very warm today, it's a _____________ day. (sun)
地图的可量测性主要体现在()。
A.数学基础
B.地图语言
C.地图整饰
D.地图综合