Cartons categories: -size type knife, knife edge repair, slotted knife, knife windmill shredders, casual propeller plane knife. Pipeline single-blade and CBN grinding wheel, and so on.

纸箱类：裁纸横切刀、修边刀、开槽刀、风车碎纸机刀、散桨机刀。流水线单刀片及CBN砂轮等。

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A new type of liquid propeller-single-blade propeller is discovered and its dynamic equations are established by means of kinematic analysis of the blade and loads applied on the blade.

提出了一种新型的流体推进器——单叶片推进器，通过对叶片的运动学和负载的分析，建立了该推进器的运动方程。

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