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【单选题】
一束波长为A的单色光由空气垂直入射到折射率为扎的透明薄膜上，透明薄膜放在空气中，要使反射光得到干涉加强，则薄膜最小的厚度为：A.
λ/4
B.
λ/(4n)
C.
λ/2
D.
λ/(2n)
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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 takes place:
A.
because products are homogeneous
B.
in order to take advantage of economies of scale
C.
because perfect competition is the prevalent form of market organization
D.
all of the above
【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 ...
【单选题】Intra-industry trade is most common in the trade patterns of
A.
the industrial countries of Western Europe.
B.
the developing countries of Asia and Africa.
C.
raw material producers.
D.
China with the rest of the world.
E.
labor-intensive products.
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