binodal quartic curve [数] 双结点四次曲线
quartic curve solution 四次曲线解
modifiable quartic curve 可调控四次曲线
quartic Bèzier curve 四次Bèzier曲线
quartic invariant algebraic curve 四次不变代数曲线
quartic rational Bézier spline curve 有理四次Bézier曲线
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The intersection of two right circular cylinders is usually quartic curve.
正交两圆柱的相贯线，一般是四次曲线。
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It is proved that the intersecting line of the two curved surface is space curve, and the equation is quartic implicit function with one unknown.
论证了两曲面的交线为空间曲线，其方程为一元四次隐函数关系式；
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