论文部分内容阅读
三角法展开就是利用三角形分解和组合来展开构件,此法通用性大,可以展开所行类型的立体筒形构件,包括前两讲所述的类型,但展开法较难,故属于上述的构件仍用前述两法为宜。三角法展开有以下要点:1.利用已知三线段作三角形;2.将平面几何图形作合理的分解和组合;3.求实长线,这是因为构件都是立体型的,只有
Triangular expansion is the use of triangular decomposition and combination to expand the component, this method is versatile, you can start the type of three-dimensional cylindrical components, including the type described in the previous two stresses, but the expansion method is more difficult, it belongs to the above components Still use the two methods is appropriate. Trigonometry has the following main points: 1. The use of known three-line segment for the triangle; 2. Planar geometry for reasonable decomposition and combination; 3. Realistic long-term, this is because the components are three-dimensional, and only