knowledge-box
3.The composite knowledge representation approach to knowledge unit, rule, procedure, vector and list,and the structure and the maintenance means of knowledge base are presented in this paper, on the basis of analysing the design process and the knowledge characteristics of mechanical products,and combining the research of Gear Box Expert System------GBES, GBES is written in Scheme Lisp,It has, run, successfully on an IBM RC/AT computer.
6.With the development of transportation rapidly, more and more large section and shallow buried tunnel will be constructed in city. Pipe roof-box jacking method is a kind of trenchless knowledge which has the advantage of little affect on ground activity and environment, especially for the case passing through road with heavy traffic and important zone.

