Quick couplers,valve and pipe,marine hardware pothandles,clamp,fire hydrant couplers,hose couplers,mechanical fittings.art and crafts,golfheads and others. 多用快速接头，阀门管首，船用五金，把手管束，消防栓联接器，软管联接器，机械配件，工艺品，高尔夫球头等。
Research and analysis have been made for buckling of long pipe string under gravity. 详细分析和研究了自重作用下竖直长管柱的屈曲问题。
The buckling equation of pipe string in horizontal boreholes is a fourth non-linear ordinary differential equation with a small parameter. 管柱在水平井眼中的屈曲方程是一个含有小参数的四阶非线性常微分方程。
