proving time
1.The Yanbian Korean Autonomous Prefecture in Jilin Province has made considerable progress in its education in the past 50 years, proving itself worthy of its time-honored reputation as ``home of education.'
4.As we all know,there is one Simson line at any point on the circumference of triangles,but in this paper, LHP theorem shows that the above conclusion is not correct for any quadrilateral pyramid in three-dimensional space and also during proving LHP theorem,fixed value theorem is proved,at the same time,one guess about the point H and point P on circumscribed sphere of tetrahedron has been concluded.
6.Firing experriments have been carried out in intermediate ballistic proving range using 25mm APFSDS projectiles,with loading cup type sabots having three/four sabot components. Time series shadowgraph photos of the sabot disposal Process for the two kinds sabots were obtained through spark shadowgtaph System with orthogonal multi-stations.
