tangential projection
... 切线喷嘴 tangential nozzles 切线投影 tangential projection 切线切变 tangential shear ...
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... 切线法 tangent method 切线投影 tangent projection 切线近似法 tangential approximation method ...
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投影切线 project tangent
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因为回转体在特殊情况下投影为圆，此类问题就转化为求圆的半径、圆心及切线了。
On special conditions, their projections are circular, these problems turn into the solutions of the circle radius center and tangent.
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