A、 Clear the pipes in order to remove corrosion.
B、 Wash the pipes so as to remove dust.
C、 Flush the pipes to remove contamination.
答案：C
A、 Clear the pipes in order to remove corrosion.
B、 Wash the pipes so as to remove dust.
C、 Flush the pipes to remove contamination.
答案：C
A. The exhaust from the Auxiliary Power Unit is dangerous.
B. The exhaust from the nozzle unit is dangerous.
C. The exhaust from the Auxiliary Power Unit inlet is dangerous.
A. Correct situation is important because it shows how the different parts of the text are relied and to prevent ambiguity.
B. Correct punctuation is important because it shows how the different parts of the text are related and to prevent ambiguity.
C. Correct punctuation is important because it shows how the different parts of the text are related and to prevent ambitious.
A. Some jobs or processes consist of several basic operations, with a number of minor steps or work items under each.
B. Some basic operations with a few small steps or work items are included in some work or processes.
C. Some jobs or processes constitute a few basic operations, with several minor steps or work items under each.
A. 慢慢地拧动活门。
B. 慢慢地转动叶片。
C. 慢慢地松开电门。
A. 飞机在地面上，主起落架和门是主要支撑的部分系统，包括诸如减震柱、转向轴、牵引支柱、门、连杆、连接螺栓等项目。
B. 主齿轮和门是飞机系统的一部分，在地面上提供主要支持。这个系统包括减震柱、转向轴、牵引支柱、门、连杆、连接螺栓等项目。
C. 主架和门是飞机在地面提供系统主要支撑的一部分，包括减震柱、转向轴、牵引支柱、门、连杆、连接螺栓等项目。
A. Make sure that the position of the wing flaps is symmetrical.
B. Make sure that the wing flaps must move symmetrically at all time.
C. The wing flaps are moved to the symmetrical position.
A. 齿轮箱是一个包含齿轮系和轴的箱体。
B. 齿轮箱包含了齿轮火车和曲轴。
C. 有一类齿轮箱包含了齿轮组和轴。
A. 油箱释压活门在85-90psi之间打开以保护油箱不会超压。
B. 为保护管路不会超压, 释压活门在85-90psi之间打开。
C. 选择活门在85-90psi之间打开以保护油箱正常工作。
A. Put the end of the rod that has a screw in the fitting.
B. Put the end of the rod that has a thread in the adapter.
C. Put the end of the rod that has a thread in the fitting.
A. 此程序可以在此服务通告中执行。
B. 在本服务通告中必须执行此程序。
C. 此程序必须在此咨询通告中执行。
