1. Analog and Digital Signal

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: 【 

11 Bluetooth

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

12 Wireless LAN

课后练习

1、单选题:
‎Where can we use  WLAN except (   )‌‎‌
选项:
A: in hospital
B: in restaurant
C: in house
D: in tunnel
答案: 【 in tunnel

16 Multimeter

课后练习

1、单选题:
‎Which is the multimeter ?  (   )​‎​
选项:
A:
B:
C:

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