... funnel-type guide frame具漏斗形承口的导向架 underground milling地下放矿漏斗开采法 He funneled the oil into the bottle.他用漏斗把油注入瓶中。 ...
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Taking maximum net present value as an optimum target and considering factors in mining, milling and metallurgy, a dynamic optimum method for optimizing cutoff grade of underground orebody is given.
以净现值最大为优化目标，同时考虑采、选、冶三阶段因素，给出了地下开采矿体边界品位动态优化的方法。
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