21. The bottom mark on the board is red

A. 操作升降舵6个行程。

B. 来回操作升降舵6次。

C. 全行程操作升降舵6次

A. 这些部件和总管附件用于排出发动机及其附件多余的液体。

B. 这些部件和总管附件用于排出发动机及其附件中的液体。

C. 用于排出发动机及其附件多余液体的部件和总管附件。

A. Acquire the flight data from the recorder.

B. Eliminate the tape about the information after flight.

C. Remove a recording of flight data from the tape.

A. 发动机的一部分,包括曲轴、主连杆组件、凸轮、凸轮传动齿轮、推杆导轨、滚轮、托架等。

B. 发动机包括曲轴、主连杆组件、凸轮、凸轮传动齿轮、推杆导轨、滚轮、托架等。

C. 发动机中的重要部分,包括曲轴、主连杆组件、凸轮、凸轮传动齿轮、推杆导轨、滚轮、托架等。

A. The Handbook producer should average the material within paragraphs in a way he considers to be most informative to the kind of pilot experienced to use the Handbook.

B. The Handbook manufacturer should arrange the material within paragraphs in a sense he considers to be most useful to the kind of pilot anticipated to use the Handbook.

C. The Handbook operator should arrange the document within paragraphs in a manner he considers to be most incentive to the kind of pilot expected to use the Handbook.

A. If you check broken wires, repair them.

B. If you find broken wires, repair them.

C. Repair broken wires

A. 如果在初始印刷版之后必须添加一页,则给添加的页面使用带字母后杰的前一页页码(例如第1-6A页、1-6B页等)

B. 如果在最终印刷版之后必须添加一页,则给添加的页面使用带字母前级的后一页页码(例如第1-6A页、1-6B页等)

C. 如果在初始印刷版之后必须删除一页,则给删除的页面装进信件并使用带前级的前一页页码(例如,第-6A页、1-6B页等)

A. The aft lanyard attached to the access door to the right APU compartment is broken.

B. The after end of lanyard attached to the access door to the right APU compartment is fractured.

C. The lanyard attached to the after end of the right access door to the APU compartment is frayed.

A. 副翼回到中立位后,确保其与襟翼齐平。

B. 扰流板回到原位后,保证和襟翼对齐。

C. 在副翼返回中心后,保证他们和襟翼相连。

A. You can install the actuator without defueling the airplane.

B. You can remove the actuator and refuel the airplane.

C. You can remove the actuator without defueling the airplane.