Introduce the several improving schemes, the characteristics and their application results about rake thickener in Huaibei Coal Preparation Plant.

介绍耙式浓缩机在淮北选煤厂的多次改造方案、特点及应用效果。

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The United States heavily subsidizes oil, gas and coal production to the tune of tens of billions of dollars, even as oil companies rake in record profits.

FORBES: Starbucks, Nike, Yahoo Tell Congress To Renew Key Wind Power Tax Credit