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【单选题】
此反应属于什么反应A.
自由基取代反应
B.
亲电取代反应
C.
亲核取代反应
D.
消除反应
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【简答题】Five people are at our table, including myself. I’ve already learnt a great deal about them in the short time we’ve been at sea, although we rarely meet except at mealtimes. First of all, there is Dr....
【简答题】根据所给的首字母提示，完成短文。Yesterday I visited the Baihai Zoo．I was s&sh根据所给的首字母提示，完成短文。 Yesterday I visited the Baihai Zoo．I was s 小题1: to find few people there．Zoos are very important places．They p ...
【简答题】(多选)蒸馏操作有加压、减压和常压之分,如下几种物系中,应该采用减压蒸馏分离的有( )*A. 热敏性物系; B. 沸点很低的物系; C. 沸点很高的物系; D. 具有恒沸点的物系。
【简答题】Several days ago, some students from the US visited our school. When we talked, I found __ 1 __ differences in school life between the US and China. For example, each class __ 2 __fifty minutes in the...
【简答题】三相交流发电机产生的三相交流电动势的相位差为 度。
【简答题】完形填空 When I was six years old, my sister, Sally Kay, was a submissive three-year-old girl. For some reasons, I thought we needed to 1 some money. So I decided we should 'hire out' as m. We visited...
【单选题】听力原文：M: Why don' t you come to our house for dinner some time next week? W: I' d like to, but we have visitors from Finland, perhaps next week. Q: Why can' t the woman accept the man' s invitation? (1...
A.
She is going to Finland.
B.
She has visitors next week.
C.
She has guests at her home.
D.
She has just visited him this week.
【简答题】根据汉语提示及首字母提示完成句子. 1. Last Sunday, we went to the b ____. Some students swam. Others made sand castles (城堡). 2. On Sunday, my parents visited their friends but I s ____ at home. Yesterday we had a math...
【单选题】Some ______ visited our school last Wednesday.
A.
German
B.
German s
C.
Germen
D.
Germen s
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