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【单选题】
在Beckman重排反应中酸催化剂的作用为( )A.
防止异构化
B.
活化与氮相连的碳上的迁移集团，利于集团迁移
C.
使肟羟基转变成活性离去基团，利于氮-氧键断裂
D.
加速重排
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反馈参考答案：
举一反三
【单选题】What are the three general purposes for giving speeches?
A.
o To persuade, act , & adjust your speaking style
B.
To inform, make people laugh, & have fun
C.
o To inform, persuade, & entertain
D.
None of the Above
【判断题】An ad valorem tariff is levied as a fixed charge for each unit of imported goods.
A.
正确
B.
错误
【单选题】An ad valorem tariff of 30 percent on a widget that costs $300 is equivalent to a specific tariff on widgets of
A.
$30.
B.
$300.
C.
$60.
D.
$90.
【简答题】看图完成答句，一空一词。 1. Where are the boys? They are ________ the ________. 2. What are one group of the boys doing? They are _________________________. 3. What are the other group of boys doing? They are ___...
【简答题】long 2.mp3: A)Visit an important . B)Go to a department store. C)Attend a sales meeting. D)Move to a new office.
【多选题】What are the three stages of smart tourism in 21st century?
A.
Pre-Experience-Digital Innovation Platform
B.
Pre-Experience- Cross Border e-Commerce O2O
C.
Experience-SOLOMO - Digital Innovation Platform
D.
Experience-SOLOMO - FinTech
E.
Post-Experience-Cross Border e-Commerce O2O
F.
Post-Experience- FinTech
【简答题】9. long 2.mp3: A)Visit an important . B)Go to a department store. C)Attend a
sales meeting. D)Move to a new office.
【多选题】What are the three stages of smart tourism in 21st century?
A.
Pre-Experience-Digital Innovation Platform
B.
Experience-SOLOMO - FinTech
C.
Post-Experience-Cross Border e-Commerce O2O
D.
Post-Experience-Cross Border e-Commerce F2F
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