New method to determine the combination shape based on two projections

Aiming at the problem of adding the third view based on the exiting two views,taking measures from the characteristics of combination surface,analyzes the difference between combination and single plane,summarizes the projection rule of sidelines on border visual surface,bosseyed performance of combination's surface and its projection characteristics,especially gives the method to determine general position plane banked to projection plane and vertical plane.Puts forward the concrete method to construct three-dimensional drawing from two projections of combination,also illustrates some examples.