俄罗斯境内最长的铁路是_______ _____铁路,全国最大的铁路枢纽是__ ______。
西伯利亚(大) 莫斯科
用所给词的正确形式填空。
1. September 1 is the _______ (one) day of our new term.
2. The boy often goes to the library to read _______ (story).
3. She usually _______ (watch) TV on Saturday evening.
4. He doesn't _______ (do) his homework every day.
5. Ms. Lin _______ (be) never late for class.
6. Look, he is _______ (put) on his shoes, he wants to play sports.
7. Kangkang usually _______ (have) breakfast at home, but sometimes in a restaurant.
8. Listen, they are _______ (read) in the classroom.
9. Today is Sunday. Some boys are _______ (fly) in the park.
10. We often take exercise after school, but today we are _______ (play) the piano.
A为只含有C、H、O三种元素的芳香烃衍生物,各物质间的相互转化关系如下图。已知:ROH+HXRX+H2O;E为加聚得到的高分子化合物,分子式为(C9H8O2)n;I中除含有一个苯环外还含有一个六元环,分子式为C9H8O2;H分子式为C18H16O6。
(1)写出A、E、I的结构简式:A ;E ;I 。
(2)B→C的反应条件为____________________。
(3)A+G→H的反应类型为 。
(4)有机物A的同分异构体只有两个对位取代基,既能与Fe3+发生显色反应,又能发生水解反应,但不能发生银镜反应。则此类A的同分异构体有4种。例如:
请写出另两种同分异构体 。