Start a safety instruction with a clear and simple command or condition.

A. 拆下附着在法兰到盖子上的四个螺钉。

B. 拆下四个螺钉，将法兰附着到盖子上。

C. 拆下将法兰固定到盖上的四个螺钉。

A. Many electrical power components are in the EE compartment.

B. Many electrical power components are in the cargo compartment.

C. Many electrical power components are in the APU compartment.

A. Remove the sleeve to tighten the sliding tube.

B. Remove the sleeve to install the sliding tube.

C. Remove the sleeve to free the sliding tube.

A. The computer needs to be backup at each interval.

B. The backup of the computer is necessary.

C. Back up your computer regularly.

A. 转动滑轮之前，拆下销子。

B. 转动扇形盘之前，取下销子。

C. 转动轮毂之前，拆下销子。

A. Make sure you press the switch when you hear the boarding music.

B. Make sure you press the switch after you hear the boarding music.

C. Make sure that you hear the boarding music after you push the button.

A. 取一个燃油样品并测量其比重。

B. 取一个燃油样品并测量其重力。

C. 取一个燃油设备并测量其比重。

A. The turbines are used to extract energy from the exhaust gases and are coupled to the crankshaft.

B. The turbines can drive energy to exhaust gas and connects crankshaft.

C. The turbines can extract energy from the exhaust gases and drive the crankshaft.

A. The manufacturer＇s marks, publication title, airplane model, and issue or revision date must shown on all pages.

B. The manufacturer＇s headline, publication title, airplane model, and issue or revision date must print on all pages.

C. The manufacturer＇s masthead, publication title, airplane model, and issue or revision date must appear on all pages.

A. 位置发射机安装在PCU下部。

B. 位置发射机安装在PCU上方。

C. PCU安装在位置传感器的上方。