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ketene(keten)
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        A member of a group oforganic compounds,general formulaR2C=CO,where R is hydrogen or an or-ganic radical. The simplest member is thecolorless gas ketene,CH2=CO;the otherketenes are colored because of the presenceof the double bonds. Ketenes are unstablean......(本文共 368 字)     [阅读本文] >>

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