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【单选题】
下列有关边界表示法的叙述语句中,错误的论述为()A.
定义了物体的边界也就唯一的定义了物体的几何形状边界；
B.
物体的边界上的面是有界的，而且，面的边界闭合的；
C.
物体的边界上的面是有向的，面的法向总是指向物体的内部；
D.
物体的边界上的边可以是曲线，但在两端之间不允许曲线自相交；
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