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【多选题】
下列关于曲线锚点的描述哪些是正确的？（）
A.
曲线锚点的两个方向线可以成任意角度
B.
曲线锚点的方向线和它所控制的曲线路径成90度关系
C.
曲线锚点的方向线和它所控制的曲线路径相切
D.
曲线锚点可以有一个方向线
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