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【单选题】
下列碳正离子中最稳定的是A.
CH 3 CH 2 C ＋ HCH 3
B.
CH 3 CH 2 CH 2 C ＋ H 2
C.
CH 2 ＝CHC ＋ HCH 3
D.
CH 3 CH=C ＋ CH 3
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