A pressurized system can cause injury to persons when they do work on it.

A. 当清洁带有绝缘层的喷管或排气锥时要小心。

B. 当移动带有隔离层的喷管或排气锥时要小心。

C. 当移动带有绝缘层的喷管或排气锥时要小心。

A. 检查机翼油箱内部。

B. 间歇地检查机翼油箱。

C. 给油箱做深入式测试。

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. 当顶升飞机或放下飞机时，始终保持水平高度。

B. 当升降飞机时，始终保持水平姿态。

C. 升降飞机时使飞机处在平衡状态。

A. Make sure to dim the panel lights during day and night operation.

B. During night operation, make sure that the panel lights are moderately bright.

C. Ensure that the panel lights are set to a dim setting during night operations.

A. 从安装位置向上提起气瓶。

B. 向上提起做动筒到安装位置。

C. 提起并安装气缸到位。

A. 连接接头是机翼上用于连接机身、短舱/挂架和起落架以及支撑机翼内设备的接头。

B. 附属装置是指机翼上用于将机身、机舱/塔架和起落架固定在机翼上以及用于支持机翼内设备的装置。

C. 附加配件是机翼上的配件，用于将机身、机舱/挂架和起落架连接到机翼上，并用于支持机翼内的设备。

A. Ensure that the porosity is less than the specified error.

B. Ensure that the depth of the hole conforms to the specified value.

C. Make sure that the diameter of the hole is less than the specified value.

A. 如果没有必需的修理程序，仔细检查燃油渗漏来确保不会渗漏更多。

B. 没有必须的维修程序。检查燃油使用频率确保使用量不会变大。

C. 无需执行修理程序。经常检查燃油渗漏情况，确认区域没有扩大。

A. 一个生成器可以为所有系统提供电力。

B. 一个发电机可以为一台系统供电。

C. 一台发电机能够给所有系统供电。