Every customer has difference in the type of drill bits, such as length, helicalangle and others.
每个公司要的钻头的形式有区别，长度、螺旋角等各不相同。
2
Furthermore, the pressure drop in helical baffles heat exchangers gets down with the increase of helicalAngle.
同时，随着螺旋角的增大，螺旋折流板换热器的壳程压力损失呈下降趋势。
3
Making use of the points measured on the drum helical curve of concrete-mixer truck, the helicalAngle formula of the helical curve is obtained by means of least square method.