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只要存在外部效应，资源配置就是有效的。()

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Assuming that sodium is naturally found primarily as a fine material rather than either

A. In the deforested area, less sodium was lost during Year 2 than during Year 3.
B. In the deforested area, less sodium was lost during Year 1 than during Year 2.
C. In the undisturbed area, about the same amount of sodium was lost during all three years.
D. In the undisturbed area, less sodium was lost during Year 2 than during Year 3.

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只要存在外部效应，资源配置就是有效的。()

Assuming that sodium is naturally found primarily as a fine material rather than either

德国政府集展馆管理者和展览经营者于一身。()

法国是当今世界国际化程度最高的国家。()

世界十大展览会有五个在汉诺威举办。()