凝聚的作用机理是什么？
参考答案：凝聚—细粒物表面的电荷在无机电解质的作用下离开其表面，压缩双电层，使其失去稳定性，而形成凝块的现象。
如图是菜豆种子的结构，请据图回答问题：
（1）菜豆种子的营养物质贮存在______里．
（2）菜豆和玉米种子都具有的结构是种皮和______．
根据句意、首字母提示完成单词.
1. Thank you for __________ (invite) me.
2. I’m planning __________ (spend) time in the beautiful countryside.
3. We’re __________ (leave) for Beijing for vacation next week.
4 We often have fun _______ (play )basketball after school.
5. We should eat a _________ (balance) diet to stay healthy.
6. She draws as ______ (well) as Han Mei.
7. My parents are learning how ______ (use ) the computer.
8. What about ______ (go ) to the concert?
9. Please ________(not talk ) in class.
10.Which book is a little _______ (easy), this one or that one?
