Through modification of operating condition, there are three classes of pure auriferous pyrite liberated from the head of mill.

通过适当地调节各种选别方法的操作条件，物料分三个级别分离提纯含金黄铁矿纯矿物。

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Depending on the reliable design theroy of fatigue strength, the paper deals with the analysis method between drum and grinding head of a ball mill.

根据疲劳强度的可靠性设计理论，对球磨机的磨头与筒体法兰结合面处的联接螺栓进分了抗疲劳分析，建立了一套可分的设计理论和机算方法。

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Improving the motion stability of the main head of tube rolling mill has great influence on improving the rolling quality of the tube.

提高轧管机主机头运动稳定性对改善钢管的轧制质量有着较大的影响。

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Karen Mill, head of the Small Business Administration (SBA), said two of every three new jobs in this country are created by small businesses.

FORBES: Obama vs. Romney -- Which Presidential Candidate Favors Small Businesses?

As soon as you are properly hydrated and fortified at the mill, head west to the town of Essex where Connecticut River Expeditions runs a Fall Foliage Cruise aboard the RiverQuest.

BBC: A Fall foliage tour of New England