In order to compare the disinfection efficacy of different disinfection methods in disinfection of stomatological handpiece in medical institutions,field sampling examination method was used to observe the efficacy of ultraviolet irradiation,disinfectant wiping and autoclaving in disinfection of toothdrill handpiece.

The hardware is a very important part of manual electric drill,which plays a role as connecting the aiguille .

Application of the horizontal smooth blasting of pneumatic drill to the excavation of protective layer of foundation surface of Permanent Ship Lock in Three Gorges Project;