A、 When a capital letter or a symbol is used for a unit of measurement, you should take it and the number before it as a word.
B、 When used in measurement, the acronym or the symbol and the related number should be taken as a word.
C、 When you write an abbreviation or a symbol for a unit of measurement, count it and the preceding number as one word.
答案：C
A、 When a capital letter or a symbol is used for a unit of measurement, you should take it and the number before it as a word.
B、 When used in measurement, the acronym or the symbol and the related number should be taken as a word.
C、 When you write an abbreviation or a symbol for a unit of measurement, count it and the preceding number as one word.
答案：C
A. Use backthrust to change the direction of the exhaust to achieve contrary thrust.
B. Thrust reverser is used to change the direction of the exhaust gases for reverse thrust.
C. To change the direction of the exhaust nozzle, the thrust reverser is used to obtain the opposite thrust.
A. If you use cleaner in a closed space, make sure that there is ventilation in the work area.
B. Ensure that there is adequate airflow in the work area when using solvent in an enclosed space.
C. If you use solvent in a confined space, make sure that there is restricted airflow in the work area.
A. When fuel comes out, you should perpare for fire eliminating.
B. It is necessary to exterminate fire properly when fuel starts to leak.
C. Use a fire extinguisher immediately if there is fuel leakage.
A. They comprise the three parts as follows:tail assembly,the structures at the rear of the airplane ,structures forming part of and attached to the wing.
B. They include three parts,one of them is tail assembly,one of them is the structures part at the rear of the airplane,one of them is structures part that forming part of and attached to the wing.
C. They include two parts,one of them is tail assembly at the rear of the airplane that serve to control and maneuver the aircraft,another of them is structures part that forming part of and attached to the wing.
A. Make sure there is no leakage of hydraulic fluid at the router.
B. Make sure there is no leakage of hydraulic fluid at the transducer.
C. Make sure there is no leakage of hydraulic fluid at the transponder.
A. 不要给螺栓施加过大力矩。
B. 安装螺栓时不要用太大的力。
C. 不要用太大的力来拧紧螺栓。
A. Wait for the paint to dry completely before polishing it again.
B. Do not apply the second layer of paint if the first layer has dried thoroughly.
C. Let the first layer of paint dry fully before you apply the second layer.
A. 这些测试可能需要额外的地面支持设备，应比操作测试更具体和详细。
B. 这些试验可能需要增加地面支持设备，应比操作测试更专业和详实。
C. 这些测试可能需要提供专门的地面支撑设备，应比功能试验更特殊和详细。
A. 用可用的方式计算压力。
B. 计算带可用公式的压力。
C. 用适用的公式计算压力。
A. Because pressurized air can blow contamination away from the display unit, you should not use it to clean the holes behind the display unit in order to avoid damaging the equipment.
B. Do not use compressed air to clean the holes on the rear of the display unit. Compressed air will push contamination into the display unit. This can cause damage to the equipment.
C. Do not use compressed air to clean the holes behind the display unit, because it can blow contaminants into display unit which may be damaged.
