题目内容
Mercantilist doctrine advocates unrestricted free trade between countries.
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A country has an absolute advantage in the production of a product when it is more efficient than any other country in producing it.
According to Ricardo's theory of comparative advantage, countries shall not produce a good, even if they have an absolute advantage in its production, if they do not produce it efficiently.
测血压时，松开气门使汞柱缓慢下降，听到第一声搏动音时，袖带内压力
下列因素除哪项外，可使血压值升高
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