On the optimum diameter problem of3 to 5 blade B-propellers, the new diagrams are compared with the old ones.
文中还就最佳直径问题，将新图谱与以前发表的三叶至五叶B型螺旋桨图谱作了比较。
On the basis of the existing parameter of an agitator, by calculating the strength and rigidity of the hollow shafting in an agitator, we get the optimum diameter of the axle.
在搅拌器现有参数的基础上，通过对搅拌器空心轴的强度及刚度计算，得出了空心轴的最佳直径值。
Meanwhile, the economic flow rate, optimum diameter and economic insulating layer thickness of the equipment and pipeline have been obtained with the model, which provide a basis for pipeline design.
该模型将同时得到经济流速、设备及管道最佳直径和经济保温厚度，可作为管道工艺设计的基础；
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