川铁锤将一铁钉击入木板,设本板对钉的阻力与钉进木板之深度成正比。在第一次锤击时,钉被击入木板1cm。假定每次锺击铁钉时速度相等,且锤与铁钉的碰撞为完全弹性碰撞,问第二次铺击时,到被击木板多深?
A、按土钉筋材强度计算
B、按破话面外土钉体抗拔能力计算
C、按破坏面内土钉体抗拔能力计算
D、从以上三者取最小的值,作为土钉抗拔力
a.你认为国际专业化生产和贸易的模式会是怎样?什么因素决定一国生产何种产品?
b.本题中国际贸易所得是什么?这些所得只存在于有该行业的国家吗?
Consider a situation similar to that in Figure 6-9, in which two countries that can produce a good are subject to forward- falling supply curves. In this case, however, suppose that the two countries have the same costs, so that their supply curves are identical.
a.What would you expect to be the pattern of international specialization and trade? What would determine who produces the good?
b.What are the benefits of international trade in this case? Do they accrue only to the country that gets the industry?
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