A.R1 = CH3, R2 = H摘要： A.R1 = CH3, R2 = H B.R1 = CH2OH, R2 = H C.R1 = COOH, R2 = H D.R1 = CH3, R2 = OH E.R1 = CH3, R2 = OCH3参考答案：……...
B.R1 = CH2OH, R2 = H
C.R1 = COOH, R2 = H
D.R1 = CH3, R2 = OH
E.R1 = CH3, R2 = OCH3
参考答案：……
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