The technical progress contribution ratio for growing velocity of China's total output of construction industry is 39.01% in the year of 2004 based on the method of growing velocity equation.
按增长速度方程法算出的2004年技术进步对中国建筑业总产值增长速度的贡献率为39.01%。
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。
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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