This operation creates a tapering of the workpiece via the use of a rotating hammer, which produces stepped columns and shafts of declining diameter.

这次行动创造了一个楔的工件通过使用旋转锤，生产，加强栏目和竖井下降的直径。

youdao

A method of stepped-diameter design for pneumatic conveying pipelines, as well as relationship among pressure loss, ratio of material to air, and mass flow rate of materials etc.

介绍气力输送管道的变径设计方法和变径管道气力输送试验中压损、料气比、物料质量流量等间的关系。

youdao