某些飞机结构是复合材料。

A. 量规的精度必须符合适用的质量标准。

B. 选择量规必须参照已有的质量标准。

C. 采购护目镜必须满足相应的质量标准。

A. Apply fuel to the steel surfaces.

B. Apply oil to the alloy surfaces.

C. Apply oil to the steel surfaces.

A. The airline operator is irresponsible for ensuring that all airworthiness instructions are complied with and that the handling, servicing and maintenance of the airplane is done when required and according to the Federal Aviation Regularities.

B. The operator is responsible for ensuring that all airworthiness directives are observed and that the handling, servicing and maintenance of the airplane is done when required and in accordance with the Federal Aviation Regulations.

C. The operator has the duty ensuring that all airworthiness directives are compiled with and that the handling, servicing and maintenance of the airplane is performed when needed and in accordance with the Feudal Aviation Regulations.

A. 系统中用于放出和收上起落架、打开和关闭起落架门的部分，包括作动机构、轮架配平装置、弹簧筒、上下门闩、操作控制装置、活门和马达、钢索、管道等。

B. 系统中用于延伸和缩回起落架并打开和关闭起落架门的那部分。包括刹车、车轮、浮子、上下门闩、操作控制装置、阀门和电机、电缆、管道等。

C. 系统中用于延伸和缩回起落架并打开和关闭起落架门的那部分。包括旋转密封套、防滑装置、压力指示器、上下门闩、操作控制装置、阀门和电机、电缆、管道等。

A. 旋转电位器，直到灯变暗。

B. 转动调节器，直到光线变暗。

C. 转动控制器，直到灯变亮。

A. Add 5 ml of hardener to the compound.

B. Add 5 ml of adhesive to the compound.

C. Put 5 ml of hardener to the component.

A. 维持发动机运转20分钟。

B. 使发动机怠速运转20分钟。

C. 快速运行发动机20分钟。

A. If one or more blades are broken, make an entry in the engine logbook.

B. If one or more blades are in place , make an entry in the engine logbook.

C. If one or more blades are absent, make an entry in the engine logbook.

A. 本规范中的示例应参照性能呈现格式、相关参数和规则。

B. 性能呈现和相关参数的格式以及规则应遵循本规范中的示例。

C. 性能陈述方式、相关的统计数据和规定应作为实例纳入本规范中。

A. 这个子系统/节有故障，航空公司不能使用。

B. 这个子系统/节预留给航空公司使用。

C. 这个子系统/部分仅航空公司适用。