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【单选题】
They ___________to put their hearts into study..A.
have made their minds
B.
have made their mind
C.
have made up their minds
D.
have made up their mind
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举一反三
【单选题】The man who hit 9 people in a row had drunk so much that his mind could no longer ________ between fantasy and reality. [ ]
A.
distinguish
B.
discourage
C.
disturb
D.
disappear
【单选题】Which one of the following statement is NOT true about transition state theory?
A.
Transition state theory describes a hypothetical "transition state" that occurs in the space between the reactants and the products in a chemical reaction.
B.
The species that is formed during the transition state is known as the activated complex.
C.
The activated complex exists in a very long time because it has a great store of energy.
D.
The activated complex can either be converted into products, or it can “revert” back to reactants.
【单选题】爱因斯坦指出光与物质有三种相互作用,( )是指处于高能级上的电子状态是不稳定的,它将自发地从高能级跃迁到低能级与空穴复合,同时释放出一个光子。
A.
受激辐射
B.
受激吸收
C.
自发辐射
D.
自发吸收
【简答题】( ) conformation is the preferred transition state geometry for the E2 elimination
【简答题】在研究光与物质的相互关系,爱因斯坦指出:光与物质的粒子体系的相互作用主要有哪三种过程?
【简答题】什么是飞行器的 稳定性和 操纵性 ?
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