Quick couplers,valve and pipe,marine hardware pothandles,clamp,fire hydrant couplers,hose couplers,mechanical fittings.art and crafts,golfheads and others. 多用快速接頭，閥門管首，船用五金，把手管束，消防栓聯接器，軟管聯接器，機械配件，工藝品，高爾夫球頭等。
Research and analysis have been made for buckling of long pipe string under gravity. 詳細分析和研究了自重作用下豎直長管柱的屈曲問題。
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個含有小參數的四階非線性常微分方程。
