The next problem is, aluminium doesn't melt until ______ degrees.
A. 650
B. 660
C. 670
D. 680
查看答案
Which statement is wrong toAluminium?
A. It's the most common metal in the Earth's crust.
B. It's cheap because it's so hard to extract from the rock around it.
C. 150 years ago, it was more expensive than gold.
D. Today, demand for aluminium is so high the ingots don't lie around.
如果当事双方能就产权进行成功的自愿谈判与交易，那么，无论产权初始界定在哪一方，其效果都一样的，都能带来最适度的资源配置。这就是（）定理的内容。
产权制度就是制度化的产权关系。这种“制度化”的重点在于两个方面：
A. 使产权关系明确化
B. 依靠规则使人们承认并合理使用产权
C. 所有权和经营权的分离
D. 产权的四项权能缺一不可
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