挑战习题
1/4单选题
难度:

1.下列反应属于加成反应的是
A CH2=CH2+Br2CH2BrCH2Br
B CH4+Cl2 CH3Cl+HCl
C CH4+2O2 CO2+2H2O
D
提示1:
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正确答案:QQ==
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