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【单选题】
有机物 CH3 〡 CH3-CH3-C-CH-CH3 〡〡 3HC CH2-CH3 的名称是A.
． 3 ， 4 ， 4 － 三甲基己烷
B.
． 3 ， 3 ， 4 － 三甲基己烷
C.
． 3 ， 3 － 二甲基 － 4 － 戊烷
D.
． 2 ， 3 ， 3 － 三甲基己烷
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