A:CH3CH=CH2+Br2 →CCl4 CH3CHBrCH2Br
B:CH3CH2OH ⇄170C∘浓硫酸 CH2=CH2↑+H2O
C:CH3COOH+CH3CH2OH →△浓硫酸 CH3COOCH2CH3+H2O
D:2CH3CH2OH+O2 →△Cu 2CH3CHO+2H2O
选出不同类别的单词。
(____)1. A. classroom B. girl C. bedroom
(____)2. A. door B. chair C. dog
(____)3. A. see B. go C. where
(____)4. A. light B. blackboard C. fans
(____)5. A. where B. what C. let
已知样本数据1、2、2、3、7,下列说法不正确的是( )