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【简答题】
在一定的温度和pH条件下,当底物浓度过量时,酶的浓度与反应速度呈()相关。 但温度升高如果导致酶(),酶活性会急剧下降。酶活性最大时的温度称为酶的()温度。酶的最适温度不是酶的特征性常数,这是因为它与()有关;pH不仅可影响酶的稳定性,还可影响()解离程度,从而影响酶与底物的结合。酶也有最适pH,最适pH也不是酶的特征性常数,它受()、()和()以及()等因素的影响。
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【单选题】What is the main idea of the passage?
A.
Art education deserves more attention.
B.
Art should be of top education priority.
C.
Art is an effective communication tool.
D.
Art education makes students more imaginative.
【单选题】What is the main characteristic of the new kind of traveler?
A.
They have considerable interest in learning to fly.
B.
They like owning and flying a personal airplane.
C.
They like to speak to the flight computer.
D.
They want to fly an airplane with minimal efforts.
【单选题】Questions 22 and 25 will be based on theconversation you have just heard. 22. What is the main topic of the talk?
A.
Characteristics of sand.
B.
How animals live in the desert.
C.
A snake’s special way of moving.
D.
Techniques of skiing.
【简答题】听下面一段材料，回答第1-3题。 1. Where is the man? A. In New York. B. In Beijing. C. In France. 2.What is the main purpose of the man’s coming visit? A. To be on holiday. B. To see the woman. C. To attend a meetin...
【简答题】请听下面一段材料，回答第1-3题。 1. Where is the man? A. In New York. B. In Beijing. C. In France. 2. What is the main purpose of the man’s coming visit? A. To be on holiday. B. To see the woman. C. To attend a meet...
【单选题】What is the main characteristic of the new kind of traveler?
A.
They have considerable interest in learning to fly.
B.
They like owning and lying a personal airplane
C.
They like to speak to the flight computer.
D.
They want to fly an airplane with minimal efforts.
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