There are four seasons in a year. They are spring, summer, autumn and winter. My favourite season is winter. Although it is cold in winter, and sometimes it snows, I play with snow. I can make a snowman with my frie
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):
小明用显微镜观察了洋葱鳞片叶表皮细胞和人口腔上皮细胞,作了如下记录,其中不正确的是( )
﹣Excuse me, where's the meeting room?
﹣ . I will show you there.