A、 When the required maintenance procedure is not very long and fairly simple, the above combination can be grouped under a title which is called maintenance practice.
B、 When the required maintenance procedure is not lengthy and is relatively simple, a combination of the above may be grouped under one heading and called maintenance practices.
C、 When the required maintenance procedures are not very long and comparatively simple, the above combinations can be bound under one subject, calling maintenance practices.
答案：B
A、 When the required maintenance procedure is not very long and fairly simple, the above combination can be grouped under a title which is called maintenance practice.
B、 When the required maintenance procedure is not lengthy and is relatively simple, a combination of the above may be grouped under one heading and called maintenance practices.
C、 When the required maintenance procedures are not very long and comparatively simple, the above combinations can be bound under one subject, calling maintenance practices.
答案：B
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. Replace the No. 1 and No. 2 computers. Then do the test again.
B. Interchange the No. 1 and No. 2 computers. Then do the test again.
C. Repair the No. 1 and No. 2 computers. Then do the test again.
A. 垂直安定面上翼肋改装
B. 垂直安定面翼尖翼梁改装
C. 垂直安定面翼尖缘条改装
A. Maximum attitude for flight planning will be affected.
B. Maximum altitude for flight planning will be affected.
C. Maximum attitude for flight planning will be effected.
A. Rub the basin with water.
B. Flush the basin with water.
C. Fill the basin with water.
A. 通气油箱排放单向活门也防止燃油从1号和2号主油箱流到通气油箱。
B. 通气油箱排放检查活门也帮助1号和2号主油箱燃油流到通气油箱。
C. 通气油箱排放单向活门也允许燃油从1号和2号主油箱流到通气油箱。
A. Before you use a word, read its definition in the approved meaning column of the dictionary.
B. Before you use a word, read its approved meaning in the definition column of the dictionary.
C. Before you use a word, read its meaning in the approved column of the dictionary definition.
A. Replace the PTU check valve.
B. Interchange the PTU one-way valve.
C. Change the PTU return valve.
A. 确保蒙皮未受损伤。
B. 确保皮肤未被侵蚀。
C. 确保蒙皮未划伤。
A. 打开左（右）系统面板L42（R42）。
B. 打开左（右）组件面板L42（R42）。
C. 打开左（右）接近面板L42（R42）。
