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。
Results Maternal BMI was increased with pregnant and there is invariablenes positive correlation between BMI and fetal weight.
结果孕期体重指数随孕周的增加而增加，且与新生儿出生体重保持着恒定的正相关关系。
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。
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