操作方式可分为上下控制和地面单人控制，也可点升点降、多层控制。
Operation mode can be divided into the upper and lower control and ground single control, but also point up point drop, multilayer control.
操作方式可分为上下控制和地面单人控制，也可点升点降、多层控制。
Operation mode can be divided into the upper and lower control and ground single control, but also point up point drop, multilayer control.
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