Research on pull-out drilling technology of coal mine gas geology;

Applications of Clear Water-gas-lift Reverse Circulation Drilling Technology to Deep-well Construction;

Based on the purpose of gas geological drilling and non-equilibrium drilling theory,the paper summed up the gas geological drilling technology and the related technological measures,and emphasized the safety construction.

Through analyzing on two different drilling techniques in the process of the exploration of a certain highway, this paper discusses on the relationship between the drilling technique and the machine-team benefit.

First of all,it was designed that the structure and the blocking process of fitness of no-dart Chinese gown according to the structure of human body and the influencing factors of synthetic fiber heating setting and blocking performance of fabrics were discussed.