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【单选题】
Figure 9-1 The figure illustrates the market for wool in Scotland. From the figure it is apparent thatA.
Scotland will experience a shortage of wool if trade is not allowed.
B.
Scotland will experience a surplus of wool if trade is not allowed.
C.
Scotland has a comparative advantage in producing wool, relative to the rest of the world.
D.
foreign countries have a comparative advantage in producing wool, relative to Scotland.
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【单选题】根据《建筑施工土石方工程安全技术规范》(JGJ180-2009)规定，“开挖深度超过2m的基坑周边必须安装防护栏杆。防护栏杆高度不应低于( )。”
A.
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B.
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C.
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D.
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