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和石灰，可使酸性采煤坑水得到很好治理。
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.
“三下”采煤的安全问题是长期以来在采矿中值得注意的问题，它关系到矿井作业的安全和经济效益问题。
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