All personnel must fully know the safety precautions.

A. 大量的高压燃油供油用于作动筒控制和到燃烧室的计量燃油，其余部分通过溢流活门返回给低压系统。

B. 除作动器控制和到燃烧室的计量燃油外，过量的高压燃油供油通过溢流阀返回给低压系统。

C. 超量的高压燃油供油用于作动筒控制和到燃烧室的计量燃油，之后通过减压阀返回给低压系统。

A. Obey the procedure if there is no debris in the oil sample.

B. If the fuel is not polluted, go on with the procedure.

C. If there is no contamination in the fuel sample, continue the procedure.

A. The specification gives the symbols for relays, diodes, and other parts of the system.

B. The specification gives the requirement for markings on relay, triode and other parts of the system.

C. The specification excludes symbols for relays, diodes, and other system parts.

A. The primary cause of valve failure is contamination of the hydraulic fluid.

B. The primary cause of valve failure is poisonousness of the hydraulic fluid.

C. The primary element of valve failure is contamination of the hydraulic fluid.

A. A servo system is a device that has the ability to carry out an order and give a response to fufill five basic requirements.

B. A servo system is a device that has the ability to carry out an order and give a response to orders. It can finish five basic requirements.

C. A servo system is a device that has the ability to respond to and carry out an order which must be able to fufill five basic requirements.

A. By using the basic provisions of FAR 21.50, revisions become consistent with the format of the specification.

B. FAR 21.50 provisions are the basic to the revisions which are consistent with the format of the specification.

C. To make revisions consistent with the format of the specification, the provisions of FAR 21.50 should be adopted as a basis.

A. 旋转盖子直到接近千斤顶并标记“+”和“-”。

B. 旋转盖子，直到你能接触到插口上“+”和“-”的标记。

C. 转动盖子直到可以接近标有“+”和“-”的千斤顶。

A. 当反推收回时，确保飞机远离人员。

B. 当反推放出时，确保人员远离飞机。

C. 当反推运动时，确保人员远离飞机。

A. AMM中有停放飞机的程序，例如发电机重复开车、控制或排放油液系统、静态接地等。

B. AMM中有停放飞机的程序，例如发电机定期开车、控制或排放油液系统、静电接地等。

C. AMM中有停放飞机的程序，例如发电机重复开车、对油液系统控制和放泄、静态接地等。

A. 给出控制面板的原理图或图片。

B. 画出娱乐面板的示意图或图片。

C. 提供仪表板的图纸或图片。