【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...
A.
Changes of manners over time.
B.
Formal manners in the earlier times.
C.
Different manners in different cultures.
D.
Development of manners in different classes.
【多选题】本课程讲解中门禁主机DS-2601接线端子里端接哪些设备?
【单选题】【题干】若投资者以98元的价格买入面值为100元、还有1年偿还期、年息6元的债券并持有到期,则该投资者的到期收益率为( )。
【单选题】The passage is mainly about______.
A.
formal and informal education
D.
the definition of education
【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...