This paper analyzes the preconditions for small and medium-sized coal mines to increase coal recovery rate, and puts forward some paths and measures for the second mining of the coal resources.
分析了中小煤矿提高煤炭资源回收率的前提保障条件,提出了复采煤炭资源的途径和措施。
Komatsu is the world's second-largest maker of construction and mining equipment, trailing Caterpillar.
小松是世界第二大建筑及采矿设备制造商,仅次于卡特彼勒。
On May 2nd Norsk Hydro announced that it was acquiring the aluminium assets of Vale, the world's second-largest mining company.
5月2日,挪威海德鲁(Norsk Hydro)公司宣布正在运作并购淡水河谷(Vale)公司旗下的铝资产,淡水河谷公司是世界第二大矿业公司。
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