分选精不仅与原煤能否顺利地按比重分层，而且还与最终产品的排卸方式有关。

The precision of grading is relation of grade specific gravity and measure of ultimately discharge of products.

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要进行有效的分选，分选材料之间的比重差别必须足够大。

For effective separation, it is essential that the density difference between the materials to be separated must be big enough.

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