A、 For normal operations, make sure the pressure relief valve is closed. An open pressure relief valve is a symptom of a problem in the fuel vent system.
B、 For normal operations, make sure the shutoff relief valve works. If you open pressure relief valve, that indicates a problem in the fuel vent system.
C、 For normal operations, make sure you close the pressure relief valve. If you leave it open, a problem will be shown in the fuel vent system.
答案：A
A、 For normal operations, make sure the pressure relief valve is closed. An open pressure relief valve is a symptom of a problem in the fuel vent system.
B、 For normal operations, make sure the shutoff relief valve works. If you open pressure relief valve, that indicates a problem in the fuel vent system.
C、 For normal operations, make sure you close the pressure relief valve. If you leave it open, a problem will be shown in the fuel vent system.
答案：A
A. 将光泽的一面贴在光泽的表面上。
B. 用粗糙的一面把表面打磨光滑。
C. 将补丁哑光的一面贴在光滑的表面上。
A. 不要使用其他未经批准的动词短语。
B. 不要使用其他未经批准的动词时态。
C. 不要使用其他未经批准的动词词组。
A. The paper must include a three-looking picture of the unit.
B. The report must inclue a three- view drawing of the unit.
C. The diagram must include a three-side drawing of the unit.
A. 本段描述了建立空机重量和力矩（相对于参考基准面）的程序。
B. 本段描述了确定空机重量和力矩（相对于基准点）的程序。
C. 本段描述了确定空机重量和力矩（与参考基准面有关）的程序。
A. 从右侧页面开始记录每个部分。
B. 每个部分都要从右侧页面开始。
C. 每个部分都写在右侧页面上。
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. Decrease the pressure in the hydraulic system.
B. Bleed the speedbrake hydraulic system.
C. Disconnect the speedbrake hydraulic system.
A. This is the maximum portion of flammable vapors in air. If the portion is bigger, when an ignition source touched the gas, it would cause the fire to be diffused.
B. This is the minimum volume of flammable vapors. If the volume is lower, when the gas contacted with an ignition source, the fire would not come out.
C. This is the minimum density of flammable vapors in air. If the density was lower, when an ignition source touched the gas, it would not cause the spread of flame.
A. Sometimes you have to change long sentences to shorter ones, remove unnecessary information, or ask an engineer to get further explanation.
B. Some time you have to incorporate long sentences into shorter ones, decrease unnecessary information, or require an engineer for further instruction.
C. Sometime you must illuminate long sentences into shorter ones, ignore information which is not necessary, or order an engineer for further definition.
A. Find the fueling valve switch for the tank that will get the fuel you are scheduled to transfer.
B. Find the fueling valve switch for the tank that you are scheduled to transfer.
C. Find the fueling valve switch for the tank that need to transfer fuel.
