题目内容
词汇与结构It also allows instrument approaches to be made procedurally at airports where air traffic control does not use ____or in the case of ____ failure.
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词汇与结构When aircraft are under radar control, air traffic controllers may replace some or all of these phases of the approach with radar____.
词汇与结构It is very common for air traffic controllers to vector aircraft to the final approach ____, e.g. the ILS.
词汇与结构Many ____ approaches allow for landing in conditions of low visibility.
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.
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