由于油水不相混溶，所以在胶印印刷过程中，油墨的乳化是（） A.

搜题请搜索小程序“爱下问搜题”

问题单项选择题

由于油水不相混溶，所以在胶印印刷过程中，油墨的乳化是（）

A.是可以避免的

B.不可以避免，但可以控制

C.不可以避免，不可以控制

D.不可以避免，胶印必需的

答案

参考答案：B

解答题

已知a＞0且a≠1，命题P：函数y=log_a（x+1）在区间（0，+∞）上为减函数；命题Q：曲线y=x²+（2a-3）x+1与x轴相交于不同的两点．若P为真，Q为假，求实数a的取值范围．

填空题

基本语法用所给单词的适当形式填空。

1. A_________(silent)fell over my friends.

2. He stood at the edge of the window for a few_________(second)and took a deep________(breathe).

3. I jumped with my arms ________(stretch)out like superman.

4. During the________(fly)，though it was just a second，I could see every eye of my friends get_________(wide).

5. I had to________(put) in hospital because part of my tongue was out in the crash.

6. I never received the serious_______(punish).

7. Was he_______(serious)punished?

8. The old should be spoken to________(polite).