《立体几何》中线面关系的定理较多,不必要也不可能在课本内一一讲叙。课本内只能讲一些对于学生掌握线面关系来说是基本的定理。六年制重点中学数学课本《立体几何》(以下简称新教材)的第一章 There are many theorems for the line-plane relationship in “Three-Dimensional Geometry”. It is not necessary and impossible to talk about it in textbooks. There can only be some theorems in the textbook that are basic for students to master the relationship between lines. The first chapter of the six-year key middle school mathematics textbook “Three-Dimensional Geometry” (hereinafter referred to as the new textbook)