题目内容
词汇与结构Many ____ approaches allow for landing in conditions of low visibility.
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词汇与结构The design takes into consideration all of the additional safety requirements for operating an aircraft in close_______ to the ground.
词汇与结构Once installed, the equipment also has additional ____ requirements to ensure that it is fully capable of supporting reduced visibility operations.
词汇与结构In all cases, additional crew training is required for such approaches, and a certain number of low visibility approaches must either be performed or ____ in a set period of time for pilots to stay 'current' in performing them.
词汇与结构When using ILS, the ____ of the signal must be protected, which requires that certain areas of the airport close to the installations being free of other aircraft and vehicles.
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