beam shelf 承梁材
deck beam shelf 甲板承梁材
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Drum line at a certain Angle of inclination fixed to the shelf beam, the tray from the high-placed, along the drum line from their own gravity down.
滚筒线按一定角度倾斜固定在货架横梁上，托盘从高端放入，沿滚筒线靠本身重力下滑。
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