A:CH2═CH﹣CH3+HCl →Δ催化剂 CH3CHCH3Cl
B:CH3CHO+H2 →Δ催化剂 CH3CH2OH
C:CH3CH2Br+NaOH →Δ醇 CH2═CH2↑+NaBr+H2O
D:CH≡CH+Br2→
计算-12ab23的结果是
读下图,回答