我国煤炭采选业的好坏直接关系到国家能源供给的大局。
Good or not of mine and pick coal in our country is important to our energy supply.
研究结果显示，我国钢铁产业对黑色金属矿采选业后向直接关联效应明显高于其它七国；
The findings show that the backward linkage effect of iron and steel industry on ferrous metal industry in china is pronounced than the relative effect in other seven countries;
研究结果显示，我国钢铁产业对黑色金属矿采选业后向直接关联效应明显高于其它七国；
The findings show that the backward linkage effect of iron and steel industry on ferrous metal industry in china is pronounced than the relative effect in other seven countries;
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