下列英语单词意思是“驾驶台”的是（）.A、MessroomB、BridgeC、Eng

After Effects中有哪些建立遮罩的方法

短文改错(共10小题；每小题1分，满分10分)

Dear Zhou Lu,

I’m writing a letter ask you for some help.

As you know, Zhang Fei and I used to be good friend. However, on one day, Zhang Fei read my private letter in secret and tell others what was written in it. Knowing this, I was extreme angry. I told her I would not be his friend any more. Hearing whatＩsaid, Zhang felt very surprised and no longer stayed with me. Facing with this, I felt very upset. I am much angry with her improper behaviour, but I can’t forget the wonderful time that I stayed with her. I wonder whether I should forgive her. And I’m afraid if I offer to make friends with her, she will refuse me. How should I do?

Your friend,

Li Hua

施工招标阶段建设监理工作的主要任务包括( )。

A．参与拟订建设工程施工招标方案

B．监督合同的实施

C．审查工程开工条件，签发开工令

D．参与施工合同的商签

E．准备建设工程施工招标条件

将浓硫酸倒入浓盐酸中，会迅速产生大量白雾，发生这种现象的原因是什么？

（）是指不同形式的催化同一反应的酶，它们之间氨基酸的顺序、某些共价修饰或三维空间结构等可能不同。