process for the exploitation of the coal bed is large or medium and large angle width

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  机译： 利用流化床煤粉的粉煤灰可改善环境污染的装置和方法，该流化床煤粉炉可防止环境污染，而将流化粉煤灰用作粉煤灰

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  机译： 中高倾角煤层的开采工艺（倾斜）

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  机译： 从原煤中提取和加工煤泥的过程和安装

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