Rear loading ramp, shown in down position.
后部装载斜板，图示为放下位置。
The goal of this exercise is to reach an equilibrium position when loading a beam.
这个练习的目的是在加载作用力到梁时要达到平衡状态。
When loading skin, the door could be set automatically at required position.
在鼓体转动时，鼓门可自动开启、关闭。
When loading skin, the door could be set automatically at required position.
在鼓体转动时，鼓门可自动开启、关闭。
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