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The article introduces the calculation of main parameter of screw-feeder for cotton-stick and design of the key parts.
介绍棉杆螺旋进料器主要参数的计算及关键元件的设计。
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The feeder then threads another piece onto the stick and a furry mountain of animals descend upon him, snarling and climbing over each other to grab it.
BBC: Africa��s wildlife in the raw
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