“If the government does not give any feedback or does not release a final report of the survey, the respondents will think they participated _______,' said the social scientist Hu.
【简答题】(14分)只含碳、氢、氧的有机物,为便于研究其燃烧时,生成物与所需氧气的量的关系,可用通式(C x H y ) m (H 2 O) n 或(C x O y ) m (H 2 O) n 表示它们。(m、n、x、y 均为) 例如:CH 3 OH、C 2 H 5 OH、C 3 H 7 OH等物质可用通式(CH 2 ) m (H 2 O) n 表示,其m分别为1,2, 3,n均为1。它们燃烧时所需的...