结合生产实际，阐述了研究地质条件的变化规律，对矿井合理开采优质资源，提高经济效益有重要的指导意义。
Combine with the practice, to study the change law of geologic condition is important significance to rational mining resource, it make the economic effect to raise.
在原燃料和装备水平一定的条件下，合理的操作制度对高炉的技术经济指标起到决定性的作用。
Under certain conditions of raw material and equipment, the reasonable operation system plays an important role in increasing technical and economical index of BF.
经由过程经济运行条件，排除不合理方案。
Pass the economy movement condition, expel the not reasonable project.
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