四棱柱

其扭力段由正四棱柱形改为正六棱柱形的，这样可以与有正内六角孔的风动扳手相插配使用，有提高工效的特点。

Therefore , the overthread screw tap can be matched with a pneumatic wrench having regular hexagonal holes via insertion , and the overthread screw tap has the advantage of high work efficiency .

螺纹自动退刀安全防撞装置以车削正四棱柱为例，进行了误差分析，得到了刀具长度与工件尺寸和容许误差间的关系。

Then by taking the regular square prism as an example , the machining error is analyzed , and the relationship among the length of the lathe tool , the work dimension and the tolerance is obtained .

首先，对于立方柱、斜四棱柱、梯形四棱柱、半圆柱、半圆柱加平板型等几种扩散体建筑模型的扩散体通道的流场进行了模拟分析。

Firstly , five kinds of architectural model are analyzed on flow field of the diffuser channel , such as the cubic column , slant four prism , four trapezoid prism , semi cylindrical and flat plate diffuser buildings .

对于本文实验，结果表明：（1）在相同阻塞比条件下，平板、三棱柱对火焰传播速度和火焰传播引起的超压影响较大，长方体次之，四棱柱、圆柱最小。

The results show below : 1 . Under condition of the same blockage ratio , plates and triple prisms have the most influence on flame propagation ( flame velocity and overpressure ) , while cylinders and Quadruple prisms have least influence on flame propagation .

介绍了以四角棱柱体土方公式为计算模型的试算法确定大型场地平整最优设计标高近似解的方法。

In this paper , the approximation calculation method based on calculation model of earthwork formula of tetragonal prism is described .