如果使用折合页，当折叠时，页码必须是可见的。

A. 附录应显示系统数据所在的章或子章。

B. 目录应显示章或子章以及系统路径所在的位置。

C. 索引应显示系统电路所在的章或子章。

A. 确保单向活门上的箭头指向远离地面供应管道的方向。

B. 确保检查活门上的箭头指向地面供应管道的方向。

C. 确保单向活门上的指针偏离地面供应管道的方向。

A. 电线代码由电路功能代码、电线编号、电线段字母和电线尺寸组成。通常会添加后缀，表示地线（N）、相位（A、B等）或热电偶材料（铝镁合金等）。

B. 电线代码由电路功能代码、电线编号、电线段字母和电线尺寸组成。通常会添加后缀，表示接地（N）、阶段（A、B等）或热敏电门材料（铝镁合金等）。

C. 电线代码由电路功能代码、电线编号、电线段字母和电线尺寸组成。通常会添加后缀，表示地线（N）、相位（A、B等）或热敏电门材料（铝镁合金等）。

A. A pilot with certification authorized by Part 43 of the regulation can perform limited preventive maintenance.

B. According to Part 43 of the regulation, A pilot is certificated to perform limited preventative maintenance.

C. A certificated pilot is authorized by Part 43 of the regulation to perform limited preventive maintenance.

A. You can use the module to disassemble the disassembly fixture.

B. The module that you can use to disassemble is the disassembly fixture.

C. You can use the disassembly fixture to disassemble the module.

A. Oxygen occurs occasionally.

B. Oxidation occurs very easily.

C. Oxygen happens very easily.

A. Make sure that the parts or surface layer are dry and free from uncontamination.

B. Make sure that the parts or surface layer are dry and free from contamination.

C. Make sure that the parts or surface lamination are dry and free from contamination.

A. The damper prevents abnormal movement of the control.

B. The control is protected from unusual movements by the damper.

C. The damper prevents sudden movement of the control.

A. Troubleshooting can only be performed after the cause of the malfunction has been found out.

B. You should perform troubleshooting according to the procedure and find out the technical failure.

C. According to the procedure, perform the troubleshooting to solve the cause of the malfunction.

A. 当施加在相同方向的压力值大于预设值时开始工作。

B. 当适用于反方向的压力值大于极限值时开始工作。

C. 当施加在反方向的压力值大于预设值时开始工作。