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下列反应属于取代反应是
A.C3H8 + 5O23CO2 +4H2O
B.CH4+C12CH3C1+HCl
C.
D.+3H2
A .C3H8 + 5O23CO2 +4H2O
B. CH4+C12CH3C1+HCl
D. +3H2