A、 The rudder is a replaceable airfoil which is mounted to the vertical fin and is used for yaw control.
B、 The rudder is a removable wing which is fixed to the vertical stabilizer and is used for pitch control.
C、 The rudder is a removable airfoil which is attached to the vertical stabilizer and is used for yaw control.
答案：C
A、 The rudder is a replaceable airfoil which is mounted to the vertical fin and is used for yaw control.
B、 The rudder is a removable wing which is fixed to the vertical stabilizer and is used for pitch control.
C、 The rudder is a removable airfoil which is attached to the vertical stabilizer and is used for yaw control.
答案：C
A. 如果B系统释压，液压动力传感组件系统就是一个提供备用压力到前缘襟翼和缝翼以及自动缝翼系统的液压马达泵组件。
B. 液压动力转换组件系统是一个液压马达泵组件，在系统B释压时，为前缘襟翼和缝翼以及自动缝翼系统提供备用压力。
C. 如果B系统增压，液压动力传感组件系统就是一个提供备用压力到前缘襟翼和缝翼以及自动缝翼系统的液压马达泵组件。
A. The temperature decreases - 0.00198°C per foot from sea level to the altitude at which the temperature is -56.5°C and zero above that altitude.
B. The temperature gradient from sea level to the altitude at which the temperature is -56.5°C is - 0.00198°C per foot and zero above that altitude.
C. The temperature drops 0.00198°C per foot from sea level to the altitude at which the temperature is -56.5°C and to zero above that altitude.
A. 在驾驶舱放置警告标识，同时告知相关人员不要操作飞控系统。
B. 在驾驶舱放置警告标识，告知人员不要操作飞控舵面。
C. 在驾驶舱放置警告标识以告知无需操作飞控舵面的人员。
A. The audio input with highest priority will be decreased by amplifier.
B. The audio input will be increased by amplifier firstly.
C. The audio input that has the highest priority will be enlarged by amplifier.
A. 制造商可制定程序，供使用CAP时发现的不适航的情况（无论是否包含在CAP中）提供反馈（来自遵循CAP的运营人和维修机构）。
B. 制造商可制定程序，供运营人和维修机构反馈在使用CAP时发现的不适航情况，无论相关部件是否包含在CAP中。
C. 制造商可以建立程序，以提供（遵守CAP的运营商和维修机构）在遵守时发现的不适航情况（无论CAP是否涵盖）的反馈。
A. The filter must be replaced before 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. Magnetic tools have an unwanted effect on the compass system.
B. Metallic tools are of positive effect on the compass system.
C. Magnets can affect the compass system adversely.
A. 螺旋桨恒速机构故障。
B. 螺旋桨恒速机构被挡住了。
C. 螺旋桨恒速传动机构不在这个位置。
A. 确保轴承安装正确。
B. 确保部件安装正确。
C. 确保齿轮是正确的安装。
A. 参考修订FAR21.50的格式，应保持与使用的规范一致。
B. 修订应以FAR 21.50规定为基础，与其规范的格式一致。
C. 修订FAR 21.50规章的格式，应参考使用修订规范的格式要求。
