According to the existing problems in the cultivation,on the basis of the resources and the climate characteristics of the eastern area of Jilin province,studies on the key cultivation techniques for Auricularia auricula using substitute were performed.

Analyzed the the existing problems of replacement material in the manufacture of pressure vessels,and relative suggestions were presented.

Substitution and Ellipsis——A Study on the Method of Syntactic Reduction;

Four substitution ways while the base of the all plastics pulg in sheet fuse is out of shape are emphasized.

It is shows in this paper that the functions of selction and substitution in the database of lubricating grease are very special and necessary.

An improved algorithm based on the equal arc length method is presented to solve substitutive arc parameters of spline hob curve section.

This paper presents a new method——using mean radius of curvature to find the substitutive arc of Archimedes spiral,with which better precision can be obtained and the calculating formulas are very simple.