An aircraft has five main structural units which consist of the fuselage, the wings, the stabilizers, the flight control surfaces and the landing gears.

A. 正确的标点符号很重要，因为它表明了文本的不同部分是如何联系在一起的，并防止了歧义。

B. 正确的标识很重要，因为它表明了文本的不同部分是如何构成的，并防止了误解。

C. 正确的符号很重要，因为它展示了文本不同部分的构成情况，并防止了错误。

A. Mach digit is the percent of true airspeed to the speed of sound.

B. Mach number is the ratio of true airspeed to the speed of sound.

C. Mach number is the proportion of real airspeed to the speed of light.

A. 航行灯从熄灭变为明亮。

B. 转弯灯从熄灭变为暗亮。

C. 航行灯从暗亮变为明亮。

A. "EMERGENCY EXIT" placard at exit hatch over Left wing is illegal.

B. "EMERGENCY EXIT" placard at exit hatch over Left wing is not legible.

C. "EMERGENCY EXIT" placard at exit hatch over Left wing is missing.

A. 发动机功率控制系统可以控制主燃油控制器或调节器，包括涡轮螺旋桨发动机上螺旋桨调速器的控制装置。

B. 发动机功率控制是控制主燃油控制器或协调器装置的系统部分，包括涡桨发动机螺旋桨调节器的控制装置。

C. 发动机功率控制系统提供了一种控制主燃油控制或协调器的方法，包括对涡桨发动机螺旋桨调节器的控制。

A. CAP是飞机持续适航的初级文件，包括各相关程序。

B. CAP是包含飞机持续适航程序的主要文件。

C. CAP是飞机持续适航的初始文件，由相关程序组成。

A. 文件必须经常修订。

B. 文件必须易于修订。

C. 文件必须容易阅读和看见。

A. "Towing and Taxiing" shall include procedures to be used such as ground turning techniques, use of parking brakes, connection of electrical power, etc..

B. "Towing and Taxiing" shall include procedures to be used such as ground steering techniques, use of chocks, connection of electrical power, etc..

C. "Towing and Taxiing" shall include procedures to be used such as ground turning techniques, use of brakes, connection of electrical power, etc..

A. 将飞机停放或存放在正常或发动机不在翼、飞机受损等;短期或长期暴露在极端天气中等异常条件下的必要说明，

B. 将飞机停放或存放在正常或发动机受损、飞机受损等;短期或长期暴露在极端天气中等异常条件下的必要说明，

C. 将飞机停放或存放在正常或发动机不可用、飞机受损等;短期或长期暴露在极端天气中等异常条件下的必要说明，

A. It is up to the manufacturer to decide whether time limits/inspection and maintenance checks should be included in a separate manual or in a maintenance manual.

B. It is the manufacturer＇s option to place Time Limits/Inspections and Maintenance Checks in a separate manual on condition that they are also included in the Maintenance Manual.

C. Time Limits/Inspections and Maintenance Checks can be included in he Maintenance manual provided they have already been placed in a separate manual by the manufacturer.