The internal characteristics of impeller under single blade in three abnormal installation angles were simulated with Fluent for the axial fan of OB-84 type,and the effect of abnormal installation angles on total pressure and efficiency characteristic curves was discussed.

This paper analyzes exception representation in C++ program and gives the classification of exception holes,in terms of which exception safety rules are constructed,and presents an approach of interprocedural bottom-up communicating of info and intraprocedural synt.

Some kinds of method of how to eliminate defects,such as DC grounding,control circuit failure,device fault, channel fault, are analysesed and discussed in this paper.

this paper put getting value range of back-passing oil cylinder installation angle and tush plank inclination.

The paper explores an analysis on the working and mechanical conditions of milling and cutting bifunctional tools on soil stabilizer rotor,and thus advances setting principles for the milling tool s anterior angle,relief angle and installation angle.

This paper describes the deviation occurred in the process of manufacturing and processing multi -stage axial -flow compressor between blade s angle and design value and this kind of deviation will cause the variation of blade s installation angle.