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下列化合物发生亲电取代反应活性最高的是
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n. a lamp in a transparent case, often a metal case with glass sides, that has a handle, so that you can carry it outside
n. A vessel belonging to a steamship-line.
v. to bend or move from a vertical position; adj. without much flesh; thin and fit
n. a person who buys and sells goods in large quantities, especially one who imports and exports goods
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