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【单选题】
下列烯烃最稳定的是( )A.
1- 丁烯
B.
反 -2- 丁烯
C.
顺 -2- 丁烯
D.
1- 戊烯
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A.
a
B.
b
C.
c
D.
d
【简答题】watch learn be have Chinese Dick and Ellen come from America. Now they 81_____________ in Tianjin. Every morning they get up very early. Then they go to work by car. They start their wo...
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