清凉油具有散热、醒脑、提神的功效,其主要成分为薄荷脑(化学式为C10H20O),下列有关薄荷脑的说法正确的是( )
A:薄荷脑中碳元素的质量分数最大
B:薄荷脑中含有10个碳原子
C:薄荷脑的相对分子质量是156g
D:薄荷脑中碳、氢元素的质量比为1:2
有关巴西的说法,正确的是( )
A. Adults keep pets with their children.
B. Pet-keeping has a very long history.
C. Pet-keeping may do harm to animals.
D. People keeps pets for their aesthetic need.
E. Caged pets become increasingly popular.
F. Pet-keeping is helpful for children’s growth.
读“地球上的五带图”填空说明图中字母所代表的地理事物