皮皮学，免费搜题
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【简答题】
有下列几种有机物：①CH 3 CH 2 CH 3 ②CH 2 =CH-CH 3 ③CH 3 COOCH 3 ④CH 3 CHO ⑤H 3 C-OH ⑥CH 3 CH 2 COOH 请把各物质的编号填入它们所属的类别，酯______，羧酸______，醛______，醇______，烯烃______，烷烃______．
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举一反三
【单选题】The tower was built ______.
A.
to guard the city
B.
for the people to see the sea
C.
as a church bell tower
【简答题】通信协议包括了通信过程的说明 , 规定了应当发出哪些控制信息 、 完成哪些动作以及做出哪些应答 , 并对发布请求 、 执行运作以及返回应答予以解释 。 这些说明构成了协议三要素中的 要素 。
【单选题】The main topic of this passage is______.
A.
why people built castles and their structure
B.
castles' structure and the people who lived in them
C.
castles' structure and the life in them
D.
castles' structure and the eating habit in them
【单选题】The People's Republic of China was established in 1949.
A.
founded
B.
started
C.
improved
D.
built
【单选题】When they built this office block, they gave no consideration to people in wheelchairs.
A.
wonder
B.
advice
C.
thought
D.
request
【单选题】Many people felt it was a pity that the ancient tower was and a modern building was being built. [ ]
A.
pulled off
B.
pulled down
C.
pulled up
D.
pulled in
相关题目：
【简答题】通信协议包括了通信过程的说明 , 规定了应当发出哪些控制信息 、 完成哪些动作以及做出哪些应答 , 并对发布请求 、 执行运作以及返回应答予以解释 。 这些说明构成了协议三要素中的 要素 。