保护电位
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The displacement Angle of strata has a great bearing on the size of coal pillar for protection of buildings on very thick unconsolidated layers, and has a great economic potentials.
地层移动角参数对巨厚松散层矿井的建筑物保护煤柱尺寸影响很大，经济潜力十分巨大。
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模块上移
模块下移
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