【单选题】阅读理解Passage 1 Manners evolved differently in different cultures. In earlier times there was a tendency for manners to become increasingly formal, and this was often viewed as progress. In the 18th a...
【简答题】某制糖厂以甘蔗为原料制糖,对产生的大量甘蔗渣按下图所示转化进行综合利用。其中B是A水解的最终产物;C的化学式为C 3 H 6 O 3 ,一定条件下2个C分子间脱去2个水分子可生成一种六元环状化合物;D可使溴水褪色;H的三聚合物I也是一种六元环状化合物。(图中部分反应条件及产物没有列出) (1)写出下列物质的结构简式:高分子化合物F___________;六元环状化合物I________。 (2)C...