Before you do servicing of the hydraulic system, isolate it.

A. 描述飞机起落架时，应描述收回方法（如有）。

B. 描述飞机起落架时，应描述撤回机构（如有）。

C. 描述飞机起落架时，应描述起落架收上机制（如有）。

A. 这个日期模块告诉你如何操作这个单位。

B. 这个数据模块告诉你如何计算这个单元。

C. 这个数据组件告诉你如何操作这个装置。

A. Do not open the entry door if the wind-speed is dangerously high.

B. Do not open the cargo door unless there is dangerous wind.

C. Do not open the cargo door if the wind-speed is dangerously high.

A. 段落之下设有子段落时，可参考本规范中子段落的编排顺序，无需完全遵守。

B. 如果一个段落包含分段落，那么本规范中分段落的呈现指令仅作为指导，不作为步骤遵循。

C. 如果一个段落包括若干子段落，那么本规范中子段落表述的指令仅作为指引而遵循。

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. For data about the location of circuit breakers, refer to the wiring list.

B. Refer to the wiring list about the adapters location data.

C. For data about the location of circuit breakers, refer to the wiring diagram.

A. 识别引起故障的部分。

B. 隔离引起故障的部分。

C. 隔离这个部分会引起故障。

A. Information on specific optional systems or equipment may be included in this section or in Section 9, Supplementary.

B. Information about noncompulsory systems or equipment may be included in this section or in Section 9, Supplements.

C. Information on specific optional systems or equipment may be included in this Section or in Section 9, Supplements.

A. 列出了技术名称一个示例。

B. 列出的技术员名称只是示例。

C. 列出的技术名称只是示例。

A. 在两个垫圈之间安装间隔装置。

B. 在两个清洗器之间安装垫片。

C. 在两个垫圈之间安装垫片。