【单选题】【消耗次数：1】
两个基本体相交，称为相贯体，其表面的交线，称为（）。
①
截交线
②
相贯线
③
素线
④
纬圆
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【简答题】
用平面切割立体，平面与立体表面的交线称为，该平面为，由截交线围成的平面图形称为。[填空(1)]
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