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氨气（NH 3 ）密度比空气小，极易溶于水，它的水溶液叫氨水，呈碱性，是一种速效肥料，实验室用加热氯化铵晶体和消石灰固体的混合物制取氨气，请回答： （1）实验室制取氨气所用的装置与制______装置相同． （2）实验室收集氨气的方法是用______． （3）将一支收集满干燥的NH 3 的试管，倒插入滴有几滴酚酞试剂的水中（如图所示），可能发生的现象是______．
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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
【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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