It was written more than 1, 300 years ago in a neat hand using ink made of oak-gall nuts mixed with carbon.
1300多年前，一双巧手用橡木汁混合木炭制成的墨水写就了这本巨作。
It was written more than 1,300 years ago in a neat hand using ink made of oak-gall nuts mixed with carbon.
1300多年前，一双巧手用橡木汁混合木炭制成的墨水写就了这本巨作。
The technology conditions for preparation of active carbon from oak wood waste by zinc chloride activation and the factors influencing of the activation were investigated.
研究了氯化锌活化废柞木屑制备活性炭的工艺条件，探讨了浸渍比、活化剂浓度、活化时间和活化温度对活化效果的影响。
The technology conditions for preparation of active carbon from oak wood waste by zinc chloride activation and the factors influencing of the activation were investigated.
研究了氯化锌活化废柞木屑制备活性炭的工艺条件，探讨了浸渍比、活化剂浓度、活化时间和活化温度对活化效果的影响。
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