The fourth part is problem situation created by the Strategies in the senior middle school math Solid Geometry Teaching.
第四部分是高中数学立体几何教学中问题情境创设的策略探索。
Straight line and plane are two basic concepts of geometry; they are also two special difficulties in the teaching of solid geometry in middle schools.
直线与平面是中学立体几何基础理论部分，也是教学中的重点与难点。
Straight line and plane are two basic concepts of geometry; they are also two special difficulties in the teaching of solid geometry in middle schools.
直线与平面是中学立体几何基础理论部分，也是教学中的重点与难点。
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