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【单选题】
下列说法中正确的是A.
能发生反应的物质不一定是醛
B.
酯在碱性条件下的水解生成相应的羧酸和醇
C.
参与酯化反应的物质一定有两种
D.
苯酚中羟基对苯环的影响是使苯环上氢原子都变的很活泼
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【单选题】听力原文：Consider three major recent California earthquakes: Loma Prieta in 1989, with a 6.9 magnitude, Northridge in 1994, with a 6.7 magnitude, and San Simeon/Paso Robles on December 22, 2003, with a 6....
A.
正确
B.
错误
【单选题】In 1994, 40 % of the paper products and plastic soda bottles produced in America were recycled. But ________ of food packaging was recovered. ( )
A.
none
B.
only half
C.
20 %
D.
2 %
【简答题】无论总角度在什么位置，它必须是一个（）镜头。
【简答题】April 27 is a special day in Britain. It’s called Take Our Daughters to Work Day. It was __ 36__ to Britain in 1994 from America. On that day thousands of girls take a day __ 37__ school and go with o...
【判断题】In 1989, Jonathan Schaeffer at the University of Alberta in Edmonton of Canada began his long-term goal of conquering the game of checkers with his program Chinook. In a 40-game match in 1992 against ...
A.
正确
B.
错误
【简答题】实验操作视频 移液管洗涤和移液管操作部分
【单选题】Task 1 Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, a...
A.
In the early 1970s.
B.
In the late 1970s.
C.
From1973 to 1994.
D.
In 1994.
【单选题】Task 1 Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, a...
A.
In the early 1970s.
B.
Inthelate1970s.
C.
From1973to 1994.
D.
ln1994.
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