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.

Preparation and application of substitution alkali TS to dyeing;

Development of substitutes for lead pigment;

Objective To study the effects of Placenta Hominis and its substitutes on learning and memory ability in mice.

The definition,features as well as advantages of bio-oil which is used as substitute fuel are presented in this article and the advantages and disadvantages of several other substitute fuels are analyzed,which shows that the process of bio-oil used as substitute fuel is an inexorable trend.

Through the analysis of CO,NO X and HC discharged from substitute fuel of motor vehicles,it's shown that the substitute fuel is good in minimizing tail gas pollution and protecting city environment.

LPG(Liquefied Petroleum Gas)was used as gasoline engine substitute fuel.