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可用于制备溶蚀性骨架片的材料是

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The law of comparative advantage indicates that mutually beneficial international trade can take place only when______.

A. tariffs are eliminated
B. relative costs of production differ between nations
C. transportation costs are almost zero
D. a country can produce more of some product than any other nation can

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针眼可变生为：

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If a group of countries abolish trade barriers between them and set the same tariffs on goods coming in from other countries, they are a______.

A. common market
B. customs union
C. federation
D. free trade area

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根据下表回答6~10题。
2010年我国65岁以上老年人口的数量约为（）。

A. 91764万人
B. 11173万人
C. 35681万人
D. 66200万人

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可用于制备溶蚀性骨架片的材料是

The law of comparative advantage indicates that mutually beneficial international trade can take place only when______.

针眼可变生为：

If a group of countries abolish trade barriers between them and set the same tariffs on goods coming in from other countries, they are a______.

根据下表回答6~10题。2010年我国65岁以上老年人口的数量约为（）。

根据下表回答6~10题。
2010年我国65岁以上老年人口的数量约为（）。