丙烷CH3CH2CH3的1HNMR谱其各组峰面积之比(由高场至低场)是

丙烷CH3CH2CH3的1HNMR谱其各组峰面积之比(由高场至低场)是
A.3:1
B.2:3:3
C.3:2:3
D.3:3:2
正确答案：A