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【单选题】
下列描述中,哪项不是队列研究的特点:
A.
属于观察性研究
B.
由果推因的研究
C.
分暴露与未暴露进行研究
D.
设立对照组
E.
可以计算发病率
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【单选题】When a government allows raw materials and other intermediate products to enter a country duty free , its tariff policy generally results in a:
A.
Effective tariff rate less than the nominal tariff rate
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Nominal tariff rate less than the effective tariff rate
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Rise in both nominal   and effective tariff rates
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Fall in both nominal and effective tariff rates
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