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Isopropenyl acetate was synthesized from ketene and acetone by direct esterification using strong acidic cation-exchange resin to substitute H2SO4 as catalyst.

乙烯为原料,用强酸性离子交换树代替浓硫酸作为催剂,直接成乙酰的中间体乙酸异

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When vitamin E acetate is vaporised by a vape's heating coil, highly toxic ketene gas is produced.

当维生素E醋酸子烟的加线圈蒸发生高度有毒的乙烯气体。

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impressionability, impressionable, impressional, impression-cup, impressionism, impressionist, impressionistic, impressive, impressive aphasia, impressively,

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