单选题

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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正确答案：A （备注：此答案有误）

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