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Liu Xumin Department of Electronic Engineering; Jinzhou Teachers College; Liaoning 121000; P. R. China Xu Weixiang Automation Research Institute; Northern Jiaotong University; Beijing 100044; P. R. China Liu Xumin Xu Weixiang Research into Freedom Sur;
Curved; surface; modeling; Double; Beta; spline; curved; surface; Elimination; hiddle; line; Piece; together; Shaded; curved; surface.;
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