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【判断题】
z=xy在点(1,1,1)处的切平面方程为x+y-z-1=0A.
正确
B.
错误
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【简答题】为什么商品的宽度比深度重要?
【单选题】Intra-industry trade theory
A.
explains why the United States might export autos and import clothing.
B.
explains why countries export and also import differentiated versions of the same product, such as different types of autos.
C.
assumes that transportation costs do not exist.
D.
ignores seasonal considerations.
【简答题】What is intra-industry trade? Is intra-industry trade consistent with the predictions of the Heckscher-Ohlin theory? Explain, and relate your discussion to evidence about trade between industrialized ...
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