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【单选题】

下列说法全都符合文意的一项是 ( ) 。 1热作用是人体在电磁场下体温升高的一种物理反应 2引发热作用和非热作用的电磁波的频率是不同的 3 研究证明,白血病和肿瘤是由于低频电磙波干扰人体微弱电磁场而造成的 4 人处往一定强度的电磁场中,就会发生热作用或非热作用 5 电磁波对机体表层不会造成明显损伤

A.
24 5
B.
134
C.
23 5
D.
12 3
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参考解析:
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【多选题】下列哪些传感器通过物理反应引起敏感元件变化来检测待测气体?

A.
MG811固体电解质气体传感器
B.
MC101催化燃烧式传感器
C.
MH-712B智能红外二氧化碳气体传感器
D.
ME-O2电化学氧气气体传感器

【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