This paper illuminates the Laboratory & Equipment Management Department of HUST tackles and adjusts the center job then does an excellence work and plays a leading role at the supporting role station from four aspects,which are "function and orientation,idea and job,status and achievement,development and learning".

They play a leading role in the life, independent on man.

The causes of the tragedies are mainly from people themselves,there\'s no clear-cut dividing line between good and bad of the tragedy protagonists,the tragedy conflicts have their own rationality and one-sidedness,and the outcome of the tragedy has national and stylistic features.

Contrast with the plot and characters, language became the real protagonist.

This paper gives some applications of the extreme principal angles between subspaces in Cn.

Using this model,the geometric parameters of the boring cutters with the maximum rake angle and minimum cutting edge angle will be obtained under given conditions while the other requirements of the tool design are met.

Based on the basic principles of differential geometry the locus equation of the movement of the grinding wheel center during clearance face grinding of the major cutting edge of a ball nose end milling cutter with equal orthogonal clearance angle is deduced,which supply the NC grinding of the clearance face of a ball nose end milling cutter with a feasible mathematical mode