In which type of economic system are all productive activities privately owned?()
A. a market economy
B. a command economy
C. a mixed economy
D. Production
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All barriers to the free flow of goods and services between member countries are removed, and a common trade policy toward nonmembers is established in a free trade area.( )
Which of the following is not an example of a primary activity?()
A. Logistics
B. Marketing and sales
Customer service
D. Production
地理空间分析的三大基本要素是空间位置、属性以及时间。()