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【单选题】
判断 CH3CH2CH2COOH 分子中 1H 核化学位移大小顺序 ( ) a b c dA.
a>b>c>d
B.
d>c>b>a
C.
c>b>a>d
D.
d>a>b>c
E.
a>d>c>b
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A.
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