Keep the backup file in a safe area.

A. This procedure does not include the removal of the cylinder.

B. This procedure does not exclude the removal of the piston.

C. This procedure does not include the removal of the piston.

A. PI 上显示完成数据复制所需的剩余时间。

B. PI显示的是复制数据所需要的时间。

C. PI上显示剩余时间以便完成数据的复制。

A. The fragile connector is usually closed.

B. The quick-break switch is normally in the off position.

C. The frangible fitting is a normally closed valve.

A. 在接触到升降舵调整片后缘时，将指示器归零。

B. 在接触到升降舵调整片前缘时，将指示器归零。

C. 当连接到升降舵调整片前缘时，将指示器一次性归零。

A. Be careful not to get acid on your skin.

B. Prohibit not to get acid on your skin.

C. Be careful not to get alcohol on your skin.

A. 结构或设备的改装可以改变基本质量和重心坐标。

B. 结构或设备大修可以造成基本质量和重心协调的改变。

C. 基本质量和重心改变后需要进行结构或设备的改装。

A. 拆除校装销和设备，以阻止控制舵面的自由运动。

B. 拆除校装销，安装能够阻止控制舵面自由移动的设备。

C. 拆除能够阻止控制舵面自由移动的校装销和设备。

A. 把手放在风扇上感受震动。如果风扇是震动的，说明风扇是通电的。

B. 把手放在风扇上感受一下是否有震动。如果你感觉到震动，说明风扇是工作的。

C. 风扇在震动，把手放在风扇上是不安全的。当你感到震动时，风扇是工作的。

A. When installing the distributor, refrain from changing the timing.

B. Ensure that you do not adjust the timing to install the distributor.

C. Do not move the timing when you install the distributor.

A. To work with electrical cable, we need tools specifically vattmeter, amperemetres and ohm meters.

B. To work with electrical cable, vattmeter, amperemetres and ohm meters are helpful tools.

C. In order to work with electrical circuit, we need tools specifically voltmeter, amperemetres and ohm meters.