To of the bottom gravel layer , its distregulation and lithology are analyzed and studied.

  • 第四纪底砾层直接覆盖在谢桥煤矿煤系地层之上, 其隔水性能影响到防水煤柱的合理留设.

  • 网络文摘精选 2025-01-18 17:05:38

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