When you do work in a fuel tank, a person must be near the tank at all times.

A. The autothrust system is in but not in operation.

B. The autothrust system is on but not in operation.

C. The autothrust system is out but not in operation.

A. In a complicated system, troubleshooting is made up of four chapters.

B. Troubleshooting in a complex system consists of four sections.

C. Four processes are combined to troubleshoot the complicated system.

A. Other format is not permitted.

B. It＇s not permissible to use this form.

C. Either format is allowed.

A. In this Section which is a separate attachment of the Handbook or as a separate document, the manufacturer shall provide an equipment list.

B. The manufacturer shall provide an equipment list in this Section, in a separate document appended to the Handbook, or as a separate document.

C. Being a separate appendix of the Handbook or as a separate document, the manufacturer shall provide a list of equipment of this Section.

A. 当你选用一个词时，一定要确保你选择的变换时态不会改变句子的意思。

B. 当你替换一个词时，一定要确保你选择的非传统词汇不会改变句子的平均句长。

C. 当你替换一个词时，一定要确保你选择的替代词不会改变句子的意思。

A. 警告：确保饮用水系统未加压。加压系统可能会造成人身伤害。

B. 注意：确保供应水系统没有压力。加压的系统会造成人身伤害。

C. 警告：确保整个水系统未加压。加压系统可能会造成人身伤害。

A. 标题页的背面应留白，以避免版本更新以及插入的飞机生产线号和注册号丢失的情况。

B. 标题页的背面应留白，以免需要改版，以及可能遗漏插入的飞机序列号和注册号。

C. 在标题页的背面留空以便于修订需要，同时避免丢失插入的飞机序列号和生产线号。

A. The power required to run an engine, in flight, at the lowest speed that will ensure satisfactory engine operation and airplane handling system.

B. The power required to run an engine, in flight, at the lowest speed that will ensure satisfactory engine operation and airplane handling characteristics.

C. The power required to run an engine, in flight, at the lowest speed that will ensure correct engine operation and airplane handling characteristics.

A. 这些组件和部件产生、控制、分配和点燃部件的燃料气缸，为活塞式发动机或涡轮发动机的燃烧室或推力增强器中的空气混合物提供电流。

B. 这些组件和部件能够产生、控制、分配用于点燃活塞发动机的气缸以及涡轮发动机的燃烧室或加力燃烧室中的油气混合气所需的电流。

C. 这些单元和部件产生、控制、分配和点燃部件的燃料气缸，为涡喷式发动机或涡轮发动机的燃烧室或推力增强器中的空气混合物提供电流。

A. 用于指示低压的压力计使用更灵活的管子，更容易展开和卷绕。

B. 用于指示较低压力的仪表使用更易弯曲的管子，线圈更易散开和缠绕。

C. 用于指示较低压力的压力表使用的软管更加柔软，可以随时解开和盘绕。