左右发动机反喷装置工作所需液压压力由谁提供（）？A、左发由液

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问题单项选择题

左右发动机反喷装置工作所需液压压力由谁提供（）？

A、左发由液压A系统，右发由液压B系统

B、都由液压A系统或备用液压系统

C、都由液压B系统或备用液压系统

D、左发由液压A系统，右发由液压B系统，也都可以使用备用液压系统

答案

参考答案：D

单项选择题

下列有关PC机的叙述中，错误的是

A．微处理器只能用于PC机

B． C机中可能包含多个微处理器

C． PC机中高速缓存（Cache）的作用是用来减少CPU的等待时间，提高系统速度

D．总线用于连接计算机中CPU、内存、辅存和输入\输出设备

句型转换

同义句转换。

1. We use words and body language to express our thoughts and opinions.

We express _____ _____ _____ words and body language.

2. He folded his arms in front of his chest and stood next to his daughter.

He stood next to his daughter _____ his arms _____ in front of his chest.

3. Looking into someone's eyes is a way to show that one is interested.

_____ _____ _____ is a way to show that one is in- terested.

4. In Russia, a visiting friend is often greeted with a kiss on the cheek.

In Russia, a friend who comes _____ _____ _____ is often greeted with a kiss on the cheek.

5. I'd like to take a rest. I am too tired to walk further.

I _____ _____ _____ a rest. I am too tired to walk further.