A:twice as much
B:much as twice
C:as much twice
D:as twice much
选出加线词意思相同的一组( )。
CH3CH=CH2+CO+H2 一定条件→ CH3CH2CH2CHO CH3CH2CH2CH2OH
CO的制备原理:HCOOH →△浓硫酸 CO↑ + H2O,并设计出原料气的制备装置(如下图所示):