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1.取一块废软木塞用锉或小锯条制成细碎木屑。 2.分别称取一克氧化铜粉末和两克细碎木屑。
1. Take a piece of waste cork with a pestle or a small saw blade to make finely divided wood chips. 2. Weigh one gram of copper oxide powder and two grams of finely divided wood chips, respectively.