题目内容
Although free trade provides benefits for consumers, it is often argued that import protection should be provided to domestic producers of strategic goods and materials vital to the nation's security.
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In the long run, competitiveness depends on an industry's natural resources, its stock of machinery and equipment, and the skill of its workers in creating goods that people want to buy.
Increased foreign competition tends to increase profits of domestic import-competing companies.
后视图是从（）投射得到的视图。
肋板、轮辐、薄壁结构纵向剖切时，不画剖面线，用（）将它们与相邻结构分开。
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