题目内容
直线与圆的位置关系,可以由圆心到直线的距离d与半径r的关系来判别。
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利用直线与圆的公共点的个数可以判定直线与圆的位置关系,而公共点的个数又可以通过直线与圆的方程组成的方程组的解得个数来确定,从而判断直线与圆的位置关系可以通过联立直线与圆的方程组成的方程组的解的个数来判断。
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按照基于对象的观点，网络模型可以看成对象模型的一种特例。
既可以将时空立方体数据模型视为时空模型，也可以看做是特殊的多维模型。
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