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【判断题】

利用横波二次反射探伤,为了避免纵波干扰,横波入射角应选择大于第三临界角。

A.
正确
B.
错误
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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.

【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.
【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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