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煤层底板等高线图
tech.
contour map of bottom surface of coal seam
煤层底板等高线图
根据各类探采工程揭穿同一煤层所获煤层底面标高资料,用正投影法投影在水平投影面上连接而成的等值线图,用以表示倾斜、缓倾斜煤层赋存状态、底板起伏情况以及地质构造特征的投影图
expl.
coal-seam floor contour map
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