contribution rate of technical progress
contribution rate of technical progress
技术进步贡献率
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The security of the stoping-cemented fill method is good and the rate of extraction is high. It has made the contribution for mine in technical progress and improving economic benefits.
胶结充填采矿法安全性好、回采率高，为矿山技术进步、提高经济效益起到了积极作用。
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