对两圆弧法绘制叶片平面投影图中相对液流角的计算误差会造成叶片不连续问题提出修正；
The problem that can be likely the lamina incontinuity is resolved, which is induced by calculating error of relatively liquid angle in the drawing lamina plane by two arc.
圆圈中的三角形表示液流方向，如果三角形尖端向外，说明液流向外输出，表示这是油泵。
In circle triangle expression liquid flow direction, if the triangle acme outward, showed the liquid flow outputs outward, expressed this is an oil pump.
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