• The acid water in coal pit can be well controlled by adding calcium carbonate and lime.

    阐述通过添加碳酸钙石灰使酸性采煤得到很好治理。

    youdao

  • Mining under the village , the railway and the water is a problem in mining, which is related to the safety and the economic benefit in every coal pit.

    “三采煤安全问题长期以来采矿中值得注意的问题,关系矿井作业的安全和经济效益问题。

    youdao

  • Mining under the village , the railway and the water is a problem in mining, which is related to the safety and the economic benefit in every coal pit.

    “三采煤安全问题长期以来采矿中值得注意的问题,关系矿井作业的安全和经济效益问题。

    youdao

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