When you do the lifting or lowering of the aircraft, make sure that the persons who operate the lifting lowering equipment have the correct training and knowledge.
A在升降飞机时，要确保操作升降设备的人员接受过恰当的培训并具备相应的知识。
B在对飞机进行平衡
C当水平放置飞机或顶升飞机时，确保操作升降设备的人员学过培训知识。
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