研究任意开口薄壁截面杆的剪力流和弯曲中心坐标的计算问题，利用合力矩定理导出计算公式，给出算例。
This paper examines the shearing flow of any thin-walled beam with open section and the calculation of the coordinates of bending center.
为此，文章提出了以大截面塑料螺旋线取代钢丝螺旋线解决传热管壁的磨损问题，以预旋结构的管口轴承座-冲推动力轮来强化自转塑料螺旋线的清洗动力矩。
This paper proposes a new way, in which the plastic twisted strip-inserts are used to solve the wear and tear problem and the special inlet bearing enlargest.
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