A、 When the weight or torque of the aircraft change, illustrate how to keep this record in order to save the exact initial values to measure the weight and heavy center in normal flight.
B、 Explain how to maintain this record when changes to the weight or moments of the airplane are made so that accurate starting data is available to calculate the weight and center of gravity during normal operation of the airplane.
C、 When the changes to the mass or momentum occur, show the way to hold this record to get the beginning information easily to compute the mass and gravity core.
答案：B
A、 When the weight or torque of the aircraft change, illustrate how to keep this record in order to save the exact initial values to measure the weight and heavy center in normal flight.
B、 Explain how to maintain this record when changes to the weight or moments of the airplane are made so that accurate starting data is available to calculate the weight and center of gravity during normal operation of the airplane.
C、 When the changes to the mass or momentum occur, show the way to hold this record to get the beginning information easily to compute the mass and gravity core.
答案：B
A. You can use the past form of technical verbs as adjectives.
B. You can use the past tense form of technical verbs as adverbs.
C. You can use the past participle of technical verbs as adjectives.
A. 向下拉下部封严时，下部轴承会出现。
B. 向下拉下部轴承时，会看到下部封严。
C. 当把低一些的轴承往上推时，低一些的封严进入视野。
A. 显示连接点的位置，转弯半径的图解应包括在内。
B. 附着点的位置和转弯半径应包括插图。
C. 插图显示连接点的位置还包括转弯半径。
A. 升降舵/升降副翼是可拆卸翼面，用于纵向控制/纵向和横向控制。
B. 升降舵/升降副翼是可移动翼面，用于纵向控制/纵向和侧向控制。
C. 升降舵/升降副翼是可拆卸翼面，用于纵向控制/纵向和水平控制。
A. 当P91和P92面板电源接通时，打开或关闭其断路器要小心，电击会造成人身伤害。
B. P91和P92之间的断路器在打开或闭合的时候要特别当心，因为点击会使人受伤。
C. 当你打开或关闭P91和P92上面的跳开关要十分小心，因为带电的设备会使人员受伤害。
A. Choose the hydraulic system you will apply pressure.
B. Pressurize the selected hydraulic system.
C. Choose the hydraulic system you will depressurize.
A. The damper prevents abnormal movement of the control.
B. The control is protected from unusual movements by the damper.
C. The damper prevents sudden movement of the control.
A. Procedures contain tasks that give instructions on how to perform them.
B. Procedures contain general instructions that show you how to do tasks.
C. Procedures contain instructions that tell you how to do a task.
A. 技术文本常常包含很长的词组，这些词组在一个句子中具有一种词性的功能。
B. 技术文件常常由很长的词汇构成，这些词在句子中的词性只有一种。
C. 技术文件常常包括长词组，在同一句子中这些词的功能是一种词性。
A. The correction installation of the upper drag strut can prevent the retraction of the lower drag strut.
B. If the upper drag strut is installed improperly, the lower one will be hit during retraction.
C. The removal of the upper drag strut has to be done properly so that the lower one can fully extend.
