A radial beat measurement system of high speed drilling machine using CCD laser diffraction is in- troduced.

From the research of physique and constitution of teenage athletes who took part in the national teenage winter and summer camp for jump events, we find that in choosing of the teenage athletes,they just pay attention to thelr heitht and constitution, but donot pay much attention to their physicalchanges in growing, neither the distinguishing nor continued observing of their growing types.