2621.当你通过接近盖板接近后机身时。

A. The valve has flaps shaped like a full circle.

B. The shape of the valve flaps is a half ring.

C. The valve flaps have a shape of half circle.

A. 当替换某个单词时,一定要确保所选择的替代词不会改变句子的意思。

B. 如果需要替换某个单词,从备用词汇中选择合适的词以确保不会改变句子含义。

C. 当替换某个单词时,始终要确保不要变动句子的意思和结构。

A. 最佳上升角速度是在尽可能短的距离内提供最多海拔增益的空速。

B. 最佳爬升角速度是使飞机能够在尽可能短的水平距离内高度增加最多的空速。"

C. 最佳上升角速度是在尽可能短的距离内传送最大高度增益的空速。

A. 降低氮气压力至 120 磅/平方英寸。

B. 减小氮气压力 120 磅/平方英尺。

C. 把氮气压力减小 120 磅/平方英尺。

A. 技术动词既可以用作动词,也可以用作名词。

B. 技术动词只能用作动词,不能用作名词。

C. 技术动词和动词的用法相同,与名词不同。

A. A mixture of fuel and oxygen can cause an explosion.

B. A mixture of fuel and nitrogen can cause an burn.

C. A mixture of gas and oxygen should cause an explosion.

A. 本章应提供制造商认为必要的信息,以便在飞机使用寿命期内可能需要进行的各种维修、大修或重大维修时正确校平飞机。

B. 本章提供制造商认定的必要信息用以保证飞机在全寿命期中进行各种维护,翻修或大修后正确校准飞机。

C. 本章提供制造商确定需要的信息用以保证飞机在运行期间进行各种维修,翻修或大修后适当配平飞机。

D. C.本章提供制造商确定需要的信息用以保证飞机在运行期间进行各种维修,翻修或大修后适当配平飞机。

A. Landing and Taxiing Aids include items such as localizer,glide slope,ILS,markers,ground guidance systems,etc.

B. Landing and Taxiing Aids include items such as localizer,sliding way,ILS,markers,landing navigation system,etc.

C. Landing and Taxiing Aids include items such as localizer,sliding way,instrumental system,markers,ground lighting system,etc.

A. The aim of STE is that readers all over the world can easily understand the technical texts and that writers who are responsible for preparing technical texts know how to prepare them in a easy method.

B. The objective of STE is to provide writers with general principles on how to prepare technical documents in a clear,simple and distinct manner that readers all over the world can easily understand.

C. The function of STE is to describe how to prepare technical texts in a easy,clear and specific way and to allow readers all over the world to understand difficultly.

A. 一台直流马达,带有永久高速磁铁,向作动筒提供动力。

B. 一台直流发电机,带有永久高速磁铁,向作动筒供电。

C. 一台直流马达,带有永久高速放大器,向油泵提供动力。