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【简答题】
洁净区与非洁净区之间、不同级别洁净区之间的压差应不低于()帕。必要时，相同洁净度级别的不同功能区域(操作间)之间也应保持适当的压差梯度。
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A.
is the philosophy of free international trade.
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was praised by Adam Smith in The Wealth of Nations .
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is the philosophy of free international trade
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was a system of export promotion and barriers to imports practiced by governments, especially in the 17th and 18th centuries
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was praised by Adam Smith in The Wealth of Nations
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【单选题】Mercantilism
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is the philosophy of free international trade.
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was a system of export promotion and barriers to imports practiced by governments, especially in the 17th and 18th centuries
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was praised by Adam Smith in The Wealth of Nations
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