支承时，尽量将划线平台的工作面调整到水平面内。
When supporting, as far as possible face plate's working surface will adjust in the horizontal plane.
急斜煤层水平分段放顶煤开采与缓斜煤层不同，工作面沿煤层厚度的水平线布置，长度短。
The horizontal section top coal caving in steep seam is different from the gently inclined seam.
利用平面图形几何重心公式计算回采工作面水平投影图形的重心坐标，然后根据影响传播角和开采深度计算下沉盆地中心位置的坐标。
The barycentric coordinates of the plane view projection of a coal face are solved with a formula of geometric gravity centre.
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