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【单选题】
以下选项中不属于异步电机的优点的是( )。
A.
结构简单
B.
坚固耐用
C.
运行可靠
D.
成本高
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【单选题】When a country is on the downward-sloping side of the Laffer curves, cutting tax rates will
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B.
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【单选题】When Country A produces both goods more efficiently than Country B, then
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country A should produce both goods and not trade
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both domestic producers and domestic consumers become better off.
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【单选题】When a country allows trade and becomes an importer of a good,
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