冀北晚更新世地层划分为迁安组与马兰组。
The Upper Pleistocene in northern Hebei is divisible into the Qian an Formation and the Malan Formation.
根据马兰矿当前生产实际，合理调整了南翼下组煤采区开准系统设计，取得了较好的经济效益。
According to the current production reality, the design of winning pioneering and preparation system about the south lower group coal adjusted reasonably, the economic benefits is better.
根据马兰矿当前生产实际，合理调整了南翼下组煤采区开准系统设计，取得了较好的经济效益。
According to the current production reality, the design of winning pioneering and preparation system about the south lower group coal adjusted reasonably, the economic benefits is better.
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