Based on the definition of basic prime number and same kind sequence of numbers, the guess of twinborn prime number is studied using the properties of same kind arithmetic sequence of numbers and the formula expressing the construction of twinborn prime number .

Starting with the introduction of design thinking of sketch,this paper analyzes the applied principle and the effects of design considerations and the way of thinking in the basic sketch and the innovation of industrial design.

Sketch in drawing arts is called basic sketch and that in design arts is called design sketch.

The present endeavor is to make an analysis of the current situation of basic sketch teaching as well as the problems found in it, trying to pave the way for cul.

Therefore,in education we should renew our ideas,do well in the relationship between basic quality and speciality training,create good conditions and guide the training of speciality along its course of developmnet.

It can provide reliable basic parameters for roadway supporting design and have excellent extension and application foreground.

According to the critical value to predict the danger index of the coal and gas outburst stipulated in "the detailed regulations to prevent and control coal and gas outburst" and in combined with the basic parameters of the seam gas,the paper analyzed and pointed out the only gas outburst in No.

The experimental research and analysis on one of the grinding basic parameters"equivalent chip thickness" which is introduced by CIRP,are reported.