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| 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 | |||
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