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【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】为什么要在飞机上禁止使用移动电话呢原来，飞机在高空中是沿着规定的航向飞行的，整个飞行过程都要受到地面航空管理人员的指挥。在高空中，飞行员一边驾驶飞机，一边用飞机上的通信导航设备与地面进行联络。飞机上的导航设备是利用无线电波来监测导航的，它接收到地面导航站不断发射出的电磁波后，就能测出飞机的准确位置。如果发现飞机偏离了航向，自动驾驶仪就会立即自动“纠正”错误，使飞机正常飞行。在能见度低的情况下，需要...
A.
据统计，近年来世界范围内每年都会发生20多起因为使用手机而引起的飞行事故，因此世界上许多航空公司规定，飞机飞行时禁止使用移动电话。