15.Install the manifold.

A. Removal of the cover is necessary.

B. It is necessary to install the cover.

C. It is a must to remove the cover.

A. 必须找到生效日期、修订号和修订日期(如申请)。

B. 必须记录生效日期、生产号和修订日期(如适用)

C. 尝试确认生效日期、修订号和修订日期(如适用)。

A. Operation time should be recorded if the pump is in emergency .

B. When you use the emergency pump,record the time of operation.

C. When the pump is for emergency use,record the time of usage.

A. Operate the dimmer switch and make sure that the intensity of the light changes.

B. Control the light knob to ensure that the light strength changes.

C. Turn the light regulator on to adjust the luminous intensity.

A. "紧急"区别于"异常"是因为在飞行中遇到不同的情况。

B. "紧急"与"异常"之间有不同,可能还由于飞行时的情况而有差异。

C. "紧急"情况和"异常"情况之间的区别也可能取决于飞行时的情况。

A. 拆卸保留的封严。

B. 移动残留的防渗漏剂。

C. 清除剩余的密封胶。

A. The filter must be replacedbefore putting new oil in the system.

B. The replacement of the filter is optional before refueling the system.

C. The filter can not be replaced unless you put new oil in the system.

A. The Federal Aviation Regulations require the use of ‘maximum continuous power’,during certification of an airframe and engine combination,to show compliance with certain standards.

B. The Federal Aviation Regulations require the compliance with certain standards for an airframe and engine combination if they use 'maximum continuous power' during certification.

C. The use of ‘maximum continuous power’ and the compliance with certain certification standards are required by the Federal Aviation Regulations.

A. 测量内侧和外侧襟翼的位移。

B. 计算内测和外侧缝翼的移动。

C. 测量移动的内侧和外侧襟翼。

A. Manufacturers' recommended time limits,maintenance checks and inspections (both planned and unplanned) are arranged in Chapter 5.

B. Manufacturers' recommended time limits,maintenance checks and tests (both scheduled and unscheduled) are arranged in Chapter 5.

C. Manufacturers' recommended time limits,maintenance checks and inspections (both scheduled and unscheduled) are arranged in Chapter 5.