对于可展曲面，本文方法给出的是精确的展开平面；
The increment FEA method and iterative procedures are derived to develop curved surfaces.
实验证明，展开基点的选取和可展度的判别是提高曲面片展开精度的重要因素。
It is proved by test that the choose of developing basic point and the judge of development behaviour are important factors to improve the precision of development drawing.
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