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【单选题】

电力线载波通信易受干扰,在线路谐波干扰小的线路上可选用()

A.
电力线载波通信
B.
光纤通信
C.
无线专网
D.
无线公网
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参考答案:
举一反三

【单选题】The biggest safety threat facing airlines today may not be a man with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reposed well over 100 incidents...

A.
They may have been caused by the damage to the radio systems.
B.
They may have taken place during take off and landing.
C.
They were proved to have been caused by the passengers" portable computers.
D.
They were suspected to have resulted from electromagnetic interference.

【多选题】窄带电力线载波通信的特点包括()。

A.
无需专门通道,节约投资
B.
无需接线,安装方便
C.
台区为单位,利于台区线损管理
D.
利用配电网为通道,干扰大

【单选题】在( )中,有较大的信号传播延迟和回波干扰。2

A.
ACARS系统
B.
静止卫星通信系统
C.
微波通信系统
D.
光纤通信系统
相关题目:
【单选题】The biggest safety threat facing airlines today may not be a man with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reposed well over 100 incidents...
A.
They may have been caused by the damage to the radio systems.
B.
They may have taken place during take off and landing.
C.
They were proved to have been caused by the passengers" portable computers.
D.
They were suspected to have resulted from electromagnetic interference.
【多选题】窄带电力线载波通信的特点包括()。
A.
无需专门通道,节约投资
B.
无需接线,安装方便
C.
台区为单位,利于台区线损管理
D.
利用配电网为通道,干扰大
【单选题】在( )中,有较大的信号传播延迟和回波干扰。2
A.
ACARS系统
B.
静止卫星通信系统
C.
微波通信系统
D.
光纤通信系统
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