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【单选题】
关于反应级数,说法正确的是( )。 (a) 只有基元反应的级数是正整数; (b) 反应级数不会小于零; (c) 催化剂不会改变反应级数; (d) 反应级数可以通过实验确定。A.
a
B.
b
C.
c
D.
d
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【简答题】考察知识点【线性相关】
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B.
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C.
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D.
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【单选题】听力原文： Let's turn our locus now to advertising. We all know what an advertisement is. It's essentially a message that announces something for sale. Now, there is an important precondition that must exi...
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The effect of advertising on world markets.
B.
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C.
Forms of communication in the American colonies.
D.
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【单选题】听力原文： Let's turn our focus now to advertising. We all know what an advertisement is, it's essentially a message that announces something for sale. Now, there is an important precondition that must exi...
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The effect of advertising on world markets.
B.
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C.
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D.
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【单选题】SECTION A CONVERSATIONS Directions: In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow. 听力原文：W: Hi, do you feel better...
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He gut a high fever.
B.
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C.
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【简答题】考察知识点【线性相关】
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