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DNA 提取实验中加氯仿离心后分三层,上层是有机溶剂,中间层是变性蛋白质,下层是 DNA 水溶液A.
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B.
错误
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【简答题】In ancient times wealth was measured and exchanged in things that could be touched: food, tools, and precious metals and stones. Then the barter system was replaced by coins, which still had real valu...
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