下列各组物质相互作用时,其中水既不作氧化剂,又不作还原剂,而反应仍属于氧化还原反应的是( )
A.氟与水反应
B.Na与水反应
C.铝与强碱液作用
D.过氧化钠与水反应
答案:D
癫痫的发作的特征有
A.短暂性
B.长时间
C.间隙性
D.刻板性
E.反复性
根据句意和汉语提示,用正确的单词填空。
1. It is ______ (有风的) today. Let's walk there.
2. Can I borrow some ______ (刷子) from Jim?
3. Look! Lucy is ______ (关闭) the window of our classroom.
4. My birthday is on______ (十二月) 20.
5. How many______ (国家) can you see on the map?
6. These books are______ (我的).
7. Can you see seven______ (盒子) under the desk?
8. We can see many ______ (孩子) in the park.
9. The______ (第五) day of a week is Thursday.
10. My ______ (脚) are big.