A、 It is necessary to define symbols, abbreviations and terminology for the clear understanding of the information presented in various sections of the Handbook.
B、 Define signatures, short words and jargon necessary for understanding clearly of the information contained in every section of the Handbook.
C、 It is important to define signs, acronyms and nomenclature for the understanding of the information provided in these sections of the Handbook.
答案：A
A、 It is necessary to define symbols, abbreviations and terminology for the clear understanding of the information presented in various sections of the Handbook.
B、 Define signatures, short words and jargon necessary for understanding clearly of the information contained in every section of the Handbook.
C、 It is important to define signs, acronyms and nomenclature for the understanding of the information provided in these sections of the Handbook.
答案：A
A. Turn the adjuster clockwise to make the display brighter.
B. Turn the adjuster clockwise to make the display dimmer.
C. Adjust the brightness of the display by turning the adjuster.
A. 用电线把电缆接连到结构上。
B. 把钢索固定到结构上。
C. 把电线系到结构上的电缆上。
A. “重大的检查条件”用于描述裂纹检查时的最小尺寸以及其他检查条件时的磨损极限、腐蚀坑深度等。
B. “重大的检查项目”用于描述裂纹检查时可检测到的最小裂纹尺寸以及其他检查项，如磨损极限、腐蚀坑深度等。
C. “重大的检查状况”用于描述裂纹检查中预期发现的最小尺寸。对于其他检查条件，指定磨损极限和腐蚀坑深度等
A. Obey the safety precautions when you do work with high voltages.
B. When working with high resistances, you should follow the safety precautions.
C. The safety precautions are optional in an environment with high voltages.
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. 在本节显著的位置应包括一个清楚的声明，内容是适航限制部分由FAA批准。
B. 当本节很显著标示出适航限制部分，这说明FAA批准了其影响。
C. 本节应在显著位置包括一份清晰的声明，说明适航限制部分的影响是FAA批准的。
A. Adjust the frequency to the value giving in table 1.
B. Adjust the frequency per the value given in table 1.
C. Adjust the frequency to the value given in table 1.
A. When you restore the airplane to its normal condition, make sure the pin is released from the release mechanism.
B. Ensure to remove the pin from the let-go mechanism after you return from the airplane to its common position.
C. When the airplane is in good condition, you must uninstall the pin of the release mechanism.
A. 为减慢固化过程，减少对化合物的加热。
B. 为减缓损耗，降低复合材料承受的热量。
C. 减少施加的热量会导致制作工序减慢。
A. Extend the nose landing gear.
B. Extend the main landing gear.
C. Retract the main landing gear.
