Equal lead thickness is assured by invariablenes temperature and pressure of extruding cylinder.
各部位温度和挤出压力趋于恒定，保证铅层厚度均匀。
Based on the two-dimension adlittoral non-invariablenes flow control equation of lakes, a hydrodynamic model of lakes was built up.
从二维浅水非恒定流的控制方程出发，建立了一个二维湖泊流体动力学模型。
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。
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