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名词解释题
lignin (木质素)
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填空题Many paper producers will preserve lignin during manufacture, because leaving the lignin will make more paper from a tree.____
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填空题Although free of lignin, paper made from cotton and rag waste can also cost more money than wood pulp paper because there is much less cotton and rag than trees.____
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问答题分离木质素的目的.
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