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【单选题】
简单碰撞理论中临界能 E c 有下列说法:正确的是:A.
、反应物分子应具有的最低能量
B.
、碰撞分子对的平均能量与反应物分子平均能量的差值
C.
、反应物分子的相对平动能在联心线方向上分量的最低阈值
D.
、 E c 就是反应的活化能
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举一反三
【简答题】A. Choose the proper animal words to complete the following sentences. Refer to dictionaries when necessary. Without my glasses, I am as blind as a ................................ (mouse / bat)
【单选题】I. Choose the proper Chinese meaning for the underlined parts. 1-5题给划线单词选择正确意思 1. I need a warm cap to match my coat .
A.
比赛
B.
搭配
C.
对手
D.
火柴
【单选题】1512a-3.choose the proper response to the question you hear
A.
How are you?
B.
Yes, I do.
C.
Here it is.
D.
My pleasure.
【单选题】In a use case model, which one of the following is a relationship that always relates two use cases?
A.
Association
B.
Aggregation
C.
Extend
D.
All of the above
【单选题】In a use case, the ( ) refers a person, another software system, or a hardware device that interacts with the system to achieve a useful goal.
A.
normal course
B.
actress
C.
actor
D.
priority
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