近年来高考试题中反复考查有关直线的知识内容,为此本文结合近年高考题,根据考查不同的直线内容,进行分类研究,以揭示此类问题的考查及求解的一般规律.一、直线的倾斜角和斜率主要考查直线倾斜角α的定义及范围(0°≤α180°),直线斜率k的定义及存在条件(当α=90°时,k不存在) In recent years, the high exam questions repeatedly examine the knowledge content of the straight lines. For this reason, this paper combines the recent college entrance examination questions and conducts classification research based on the examination of different straight line contents to reveal the general rules of examination and the solution of such problems. The angles and slopes mainly examine the definition and range of the straight line tilt angle α (0°≤α180°), the definition and existence conditions of the straight line slope k (when α=90°, k does not exist)