（）即为赫克歇尔－俄林模型(Heckscher–Ohlin model，即H-O模型)。

The theory of comparative advantage was proposed by: ( ) A: Adam Smith B: Karl Marx C: Eli Heckscher. D: David Ricardo

The earliest statement of the principle of comparative advantage is associated with A: David Hume. B: David Ricardo. C: Adam Smith. D: Eli Heckscher.

The earliest statement of the principle of comparative advantage is associated with() A: David Hume. B: David Ricardo. C: Adam Smith. D: Eli Heckscher. E: Bertil Ohlin.

（）即为赫克歇尔－俄林模型（Heckscher–Ohlinmodel，即H-O模型）。 A: 要素禀赋理论 B: 技术差距理论 C: 比较优势理论 D: 产品生命周期理论