This material causes corrosion of surfaces with no protection.

A. 在程序中，提供简短，清晰的指令并且直接向读者讲话。

B. 在程序中给出简短，清晰的指令，直接向读者陈述。

C. 在程序执行中，要向读者直接发话，给出简短清晰的指令。

A. The lower seal appears as the lower bearing is pulled down.

B. You can see the lower seal before pulling the lower bearing down.

C. Only after you pull the lower seal down can you see the lower bearing.

A. The actuator receives a hydraulically controlled mechanical command from FCC who sends an electrical commands and the aileron and the elevator power control units(PCU) will carry out this command.

B. FCC sends an electrical order to autopilot actuator. The actuator converts it to a hydraulically controlled mechanical command. The aileron and the elevator power control units(PCU) will carry out this command.

C. FCC sends an electrical commands to autopilot actuator. The actuator receive it to a hydraulically controlled unit . The aileron and the elevator power control units(PCU) will carry out this command from hydraulically controlled unit.

A. Tighten the threads, nuts, clips, or connectors to the correct torque.

B. Tighten the bolts, nuts, clamps, or connectors to the correct torque.

C. Tighten the bolts, spacers, clips, or connectors to the correct torque.

A. Apply weight on the surface of the patch to make sure that the parts bond correctly.

B. The parts can be aligned properly by applying force on the surface of the patch.

C. In order to correctly attach the parts, the patch surface should be compressed.

A. 排气系统指将发动机燃气排出机外的组件和部件。

B. 排气系统指将发动机引气导入机身的装置和组件。

C. 引气系统指将发动机废气导出机外的装置和组件。

A. 当前的服务通告清单是人工编制的。

B. 目前的服务通告清单在手册级别编制。

C. 正式的勤务通告单由人工搜集。

A. In such cases, the introduction should notice the systems related in the manual，manufacturers may also choose to group related systems where the simplicity of the product permits.

B. In such cases, the introduction should note the systems covered in the manual，manufacturers may also choose to group related systems where the simplicity of the product permits.

C. In such cases, the introduction should note the systems comprised in the manual，manufacturers may also choose to divide related systems if the product is simple enough.

A. Wrap two tapes around the pipe connectors.

B. Wrap the pipe joints with tape twice.

C. Wind two layers of tape around the pipe joints.

A. When hydraulic power is supplied, keep persons and equipment away from all control surfaces and landing gear.

B. When supplying power to the hydraulic system, persons and equipment should be away from all control surfaces and landing gear.

C. Persons and equipment shall be away from all hydraulic system control surfaces and landing gear when supply pressure.