preparación de carbón (n)

Kohleaufbereitung (f)

coal beneficiation (n)

coal cleaning (n)

coal dressing (n)

coal preperation (n)

coal refining (n)

coal treatment (n)

coal washing (n)

coal-preparation process (n)

洗煤 (n)

煤处理 (n)

煤精炼 (n)

选煤 (n)

选煤过程 (n)