问题 单项选择题

以下哪一种是常见的脉冲数字调制()

A、PAM(脉幅调制)

B、PDM(脉宽调制)

C、PPM(脉位调制)

D、PCM(脉码调制)

答案

参考答案:D

翻译题

Translate the following sentences. (翻译下列句子)

1. 你有多高?

                                                                     

2. 你比我矮。

                                                                    

3. 你怎么了?

                                                                    

4. 你今天看起来不太高兴。

                                                             ___

5. 你周末经常去干什么?

                                                              ___

6. 他上周末干什么了?

                                                                    

7. 你怎么去的那儿?

                                                                   

8. My room is 15 square meters.

                                                                __

9. How do you feel if you have a flu?

                                                                __

10. My mother is going to buy me a new skirt.

                                                  _________

填空题