402.To prevent unwanted friction,polish the surface.

A. 乘客空调供给从混合总管处获得空气。

B. 乘客空调分配从混合总管处获得空气。

C. 乘客空调分配从混合软管处获得空气。

A. 主要用于进入货舱的外舱门,包括结构件、门闩、把手、隔热材料、内衬、控制器等。

B. 主要用于进入货舱的内舱门,包括结构件、闩锁机构、扶手、绝缘材料、内衬、操纵装置等。

C. 主要用于进入货舱的外舱门,包括结构、闩锁机构、扶手、绝缘材料、内衬、控制装置等。

A. The CAP compiler should determine the format and layout,it is desirable that the format and layout should be similar to the compiler's current documents.

B. The format and layout should be determined by the CAP producer,it is intended that the format and layout shall be similar to the producer's existing files.

C. The format and layout should be determined by the CAP producer,recognized that it is desirable the format and layout should be the same as the producer's existing documentaries.

A. 用彩笔涂颜料。

B. 用刷子搅拌油漆。

C. 用刷子涂油漆。

A. The operation rods are connected to the hydraulic feedback.

B. The operation barrels are connected to the hydraulic return.

C. The actuators are connected to the hydraulic return.

A. If the error is more than 3 degrees,calibrate the glide slope.

B. If the error is more than 3 degrees,calibrate the compass.

C. If the error is more than 3 degrees,calibrate the gyroscope.

A. If you use cleaner in a closed space,make sure that there is ventilation in the work area.

B. Ensure that there is adequate airflow in the work area when using solvent in an enclosed space.

C. If you use solvent in a confined space,make sure that there is restricted airflow in the work area.

A. 结构类别分为三类:主要的、次要的、备用的。

B. 结构类别分为三类:主要的、次要的、必需的。

C. 结构类别分为三类:主要的、次要的、第三位的。

A. 环境系统包括的那些装置和部件,提供增压、加热、冷却、湿度控制和过滤,并对压力密封的机身区域的通风空气进行处理。

B. 通风系统包括的装置和部件可以用于加压、加热、冷却,湿度控制、处理空气,从而为压力密封内区域通风。

C. 循环系统包括那些装置和部件,提供释压、加热、冷却、温度控制、压缩和处理空气,来为压边封严条内的区域通风。

D. B.通风系统包括的装置和部件可以用于加压、加热、冷却,湿度控制、处理空气,从而为压力密封内区域通风。

E. C.循环系统包括那些装置和部件,提供释压、加热、冷却、温度控制、压缩和处理空气,来为压边封严条内的区域通风。

A. The location where a red mark is on the pin needs to be lubricated.

B. You should identify the red mark on the lubricant point.

C. The lubrication point shows thatyou can find marks on the pin.