八面体间隙 3) tetrahedral gap 四面体间隙 1. Fitting oftetrahedral gapof the intermeshing twin-screw; 常规螺杆元件四面体间隙的拟合 2. The geometry of intermeshing co- rotating twin- screw, especially the shape and volume of thetetrahedral gapof the equipment were studied throughly and the mathema...