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。

  • 互联网摘选 2025-01-20 19:13:03

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