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。
On the hypothesis of plane cross section, L-shaped reinforced concrete column was divided into three fragment line element of elastoplastic zone at both ends and elastic zone in the middle.
在平截面假定的前提下，将钢筋混凝土L形柱划分为两端弹塑性区、中间为弹性区的三分段杆单元模型。
The orientation plate, the axial line in the handle, and the middle axial line of the drill rod are on the same plane.
本实用新型所说的定向板与手柄中轴线、钻杆中轴线在同一平面。
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