Burnt rock is come into being coal bed self-ignite and bring wall rock metamorphose and has special engineering geological characteristics.
烧变岩是煤层自燃引起周围围岩变质而形成的，具有特殊的工程地质性质。
Burnt rock is come into being coal bed self-ignite and bring wall rock metamorphose and has special engineering geological characteristics.
烧变岩是煤层自燃引起周围围岩变质而形成的，具有特殊的工程地质性质。
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