18.Only approved persons are permitted to stay in this area.

A. 　如果没有液压动力放下前起落架,起落架的重量和气流会将其推至放下位。

B. 　如果液压动力未将前起落架放下,起落架的重量和气流会将其放下。

C. 　液压动力可以放下前起落架,起落架的重量和气流也可以将其推至放下位。

A. 　在选择检查时间或对疲劳应力的影响方面,没有理性的考虑造成腐蚀的原因。

B. 　(从基本原理角度)选择检查时间或对疲劳应力的影响方面,没有考虑造成腐
蚀的原因

C. 　在选择检查时间或对疲劳应力的影响方面,没有(从基本原理角度)考虑腐
蚀的影响。

A. 　移动后面的油门杆。

B. 　将油门杆向后移动。

C. 　移动油门杆的后部。

A. 　the lower seal comes into view when you pull the lower bearing down.

B. 　The lower seal shows as the lower bearing is pulled down.

C. 　The lower seal appears as the up bearing is pulled down.

A. 　ILLUMINATED

B. 　LIGHTED

C. 　BRIGHTENED

A. 　Examine the doorstop fittings for cracks and corrosion.

B. 　Examine the doorstop fittings for dent and corrosion.

C. 　Examine the doorstop fittings for cracks and nick.

A. 　如果不同时这样做,则会卡住定位销。

B. 　如果不同时这样做,则会导致定位销磨损。

C. 　如果不同时这样做,则会导致定位销脱落。

A. 　把车拖到安全的地方,在那里可以使用标准程序。

B. 　拉动车到安全的区域,你可以使用标准过程。

C. 　把车拖到平坦的地方,在那里可以使用标准程序。

A. 　The basis for assuring an airplane remains airworthy and safe to operate
is to combine the manufacturer’s requirements with sound inspection and
maintenance practices.

B. 　To ensure airworthiness and safe operation of an airplane, it is
essential to follow the manufacturer’s instructions in the utilization
of airplane, and perform sound inspection and maintenance as well.

C. 　Airworthiness
aircraft
utilization as required by the manufacturer, so sound inspection and
maintenance practices are carried out.

A. 　确保箭头指向燃油流量流动的方向。

B. 　确保标记指向燃油流量流动的方向。

C. 　确保标记指向燃油流量相反的方向。