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【单选题】
鸦片战争是中国近代史的起点吗?A.
是
B.
不是
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皮皮学刷刷变学霸
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【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...
【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.
【单选题】蒸馏操作有加压、减压和常压之分,如下几种物系中,应该采用加压蒸馏分离的有( )。
A.
分离石油气
B.
分离乙醇和水
C.
乙醛酸法合成香兰素后进行分离得到香兰素（一种食品添加剂）
D.
分离苯-甲苯体系
【单选题】Some ______ visited our school last Wednesday.
A.
German
B.
German s
C.
Germen
D.
Germen s
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