Three Perpendicular Line Theorem In Space Analytic Geometry
空间解析几何中的三垂线定理
There are three semicircular canals, perpendicular to each other, constitute the three surface space.
半规管有三个，互相垂直，构成空间的三个面。
The Perpendicular Plane in Four Dimension Space DEVELOPMENT OF A ROBOT CAPABLE OF MOVING ON A VERTICAL WALL
四维空间内的垂面垂直壁面行走机器人系统研制
Movement of Contact Surface between Gases in Oscillating Tube The Perpendicular Plane in Four Dimension Space.
振荡管内接触面的运动四维空间内的垂面
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