支架横撑
The invariablenes condition of circle girth of the join-line end of the main pipe was set up and the join-lines on Y-tee to be ellipse was made certain.
建立了圆柱分支管Y型三通的主管相贯线处的周长不变的条件,确定了相贯线为椭圆。
The Upper Bound and the Index Set for Lewin Index of Primitive Digraph with Girth 2
围长为2的n阶本原有向图的Lewin指数集
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