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【刚挖出来的煤,为什么要水洗过后才能用?】为什么黑乎乎的煤还要用水洗?小时候家里卖废纸壳用水打湿是为了增重,难道洗煤也是为了增重吗?洗煤用过的水又该怎么处理呢?(@科普记)
  • 00:04:34

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