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有理插值样条因其具有可任意选择的参数 ,在曲线、曲面的控制设计中显示了其它一般样条曲线所不具有的可约束性 ,也正是因为其具有参数 ,给其逼近性质的讨论增加了困难.“,”Due to randomly selectable parameters,in curve and surface design,the rational cublic interpolant shows constrained properties which are denied to other splines.and just because of these parameters,more diffculties are added in discussing the interpolants approximation properties.