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对于需要施旁站监理的施工关键部位、关键工序、施工企业应在进行施工前〔 〕小时，书面通知工程监理机构。
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直线与圆的位置关系分别有相交、相切、相离三种。
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。
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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