The fuselage is round and tapered front and rear with a pointed nose and tailcone and a belly fin.
圆形机身和锥形前部和尾部采用一个尖形前鼻和尾锥和一个腹鳍。
2
The inner cone grinding method of twist drills is discussed. The phenomenon of up tail in the grinding method is exposed and the solving idea is given.