1.AnalogandDigitalSignal

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: 【 

11Bluetooth

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

12WirelessLAN

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:

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