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单选题
在正常或异常的情况下，这些指令是必需的，例如从柔软的地面、湿滑的或结冰的表面上拖拽飞机并且在发动机被拆除或飞机损坏的状况下。
A
These instructions are required for towing aircraft in normal or abnormal conditions, such as from soft ground, wet or icy surfaces and in the case of engine is removing or aircraft is damaging.
B
These instructions are necessary for towing the aircraft under normal or abnormal conditions, such as from a wet or icy surface on a soft ground and when the engine is removed or the aircraft is damaged.
C
These instructions are necessary to tow or push the aircraft in normal or abnormal conditions such as towing from soft ground and slippery or icy surfaces, with engines removed, or aircraft damaged.
答案解析
正确答案：C
相关知识点：
飞机拖拽指令考点要记
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