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【单选题】
进行串联超前校正后，校正前的幅值穿越频率ωc与校正后的幅值穿越频率ωc1的关系，通常是（ ）A.
ω c = ω c 1
B.
ω c > ω c 1
C.
ω c ω c 1
D.
ω c 与 ω c 1 无关
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【简答题】自催化反应是 。自催化反应的反应速率最大的C A 值为
【单选题】As regards social conventions, we must say a word about the well-known English class system. This is an embarrassing subject for English people, and one they tend to be ashamed of, though during the p...
A.
The working classes tend to live a more formal life.
B.
They still use old words like “Sir” in their everyday life.
C.
Working-class people use slightly varying kinds of “received pronunciation”.
D.
Working-class incomes have grown very much recently.
【单选题】下列说法错误的是( )
A.
醇和酚的官能团都是羟基
B.
含有羟基的化合物一定是醇类
C.
乙醇和苯酚都能与金属钠反应
D.
苯酚能与氢氧化钠溶液反应，乙醇不能与氢氧化钠溶液反应
【简答题】书p88 Put the Chinese in the brackets into English to complete the following sentences. (1) Women (起重要作用) in the development of our country. (2) We are still students now We have to (依靠) our parents to...
【简答题】I can still remember my elementary school teacher very well. Sue was my first grade teacher, and she was warmhearted. We have real lessons with her. I would often get into trouble in her class, but I...
【单选题】下列说法正确的是（ ）
A.
含有羟基的化合物一定属于醇类
B.
代表醇类的官能团是与链烃基相连的羟基
C.
酚类和醇类具有相同的官能团，因而具有完全相同的化学性质
D.
分子内有苯环和羟基的化合物一定是酚类
【简答题】醇与酚的官能团是什么？
【简答题】用所给词的正确形式填空。 ill active sleep weak awful 1. I stayed up late watching TV lastnight, so I felt very ______ in class today. 2. The boy had to stop going to schoolbecause of his terrible ____...
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