This information belongs as a necessary constituent to the "section method" of the spiral system.
这信息作为“螺旋式”体系的“占区方式”的必要组成部分。
The ellipse section spiral case can give excellent hydraulic performance by optimizing design.
通过优化设计，椭圆型蜗壳可获得优异的水力性能。
The ellipse section spiral case can give excellent hydraulic performance by optimizing design.
通过优化设计，椭圆型蜗壳可获得优异的水力性能。
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