270. 遵守拖飞机工作程序。

Obey the working procedures for towing the airplane;

Obey the working procedures for jacking the airplane;

Obey the working procedures for mooring the airplane;

正确答案：A

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3093. 把下列件号按照数字顺序排列

3092. If possible, always tell your reader what can occur if the safety instruction is not obeyed

3091. Make sure that you can hear the flight deck conversation in the headphone

3090. 此测试或检查的复杂性和严格性将根据装置运行的条件而有所不同。

3089. 将其中一个空调组件电门置于“高流量”位。

3088. When the wind speed decreases to less than 30 knots, you can open the cargo door

3087. To make something visible by an external source such as light

3086. Make sure that you do not connect words which are not related, because this will change the meaning of the noun cluster

3085. 杂项类别包含很多种部件或零件,我们选择了其中五种。

3084. This part provides for a uniform method of arranging and identifying specific subject material