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对于自然垄断，则通常采取管制的方法加以限制。()

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在经济运行中，常常可以看到其不能有效配置资源的现象，被称为“市场失灵”。()

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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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德国政府集展馆管理者和展览经营者于一身。()

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