作业

1、单选题：
‍Which is the analog signal?‎
选项：
A:

B:
C:  
D:  
答案: 【 
】

课后作业

1、单选题：
‏Which is the digita signal?‎
选项：
A:
B:
C:  
D:  
答案: 【 】

课后练习

1、判断题：
‏Bluetooth technology is free for all the people‏
选项：
A: 正确
B: 错误
答案: 【 正确】

三单元测验

1、单选题：
Modulation is the process of shifting spectrum of one center (    ) to another.‍‍‍
选项：
A: amplitude
B: frequency
C:  phase
D:  
答案: 【 frequency】

2、单选题：
Which one is ground-wave propagation? (       )‎‍‎
选项：
A:
B:
C:
D:  
答案: 【 】

3、单选题：
 Which propagation mode has the longest transmission distance? (   )‏‏‏
选项：
A: Sky-wave propagation
B: Line-of-sight propagation
C: Ground-wave propagation
D:  
答案: 【 Sky-wave propagation】

4、单选题：
‎The first image sensor was invented in(    )‌‎‌
选项：
A: Bell Lab
B: Kodak company
C:  
D:  
答案: 【 Bell Lab】

5、单选题：
​Which is not the characteristics of CMOS(    )‎​‎
选项：
A:  strong anti-noise ability
B: highly integrated
C:  increasing the rate of final products
D:  
答案: 【 highly integrated】

6、单选题：
 Bluetooth technology makes the office in an (    ) status.‏‌‏
选项：
A: confused
B:  constant
C: efficient
D:  
答案: 【 efficient】

7、单选题：
What is the data rate of bluetooth technology?  (    )‍‏‍
选项：
A:  10 Gb/s 
B: 1 Gb/s
C:  10 Mb/s
D: 1 Mb/s
答案: 【 1 Mb/s】

8、单选题：

 Which application of bluetooth technology as show