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Microsoft is a/an（）in Windows operating system.
Microsoft is a/an（）in Windows operating system.
A.monopoly
B.competitive firm
C.oligopoly
D.monopsony
正确答案：monopoly
标签：
中级微观经济学
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Suppose that Dent Carr's long run total cost of repairing s cars per week is c（s）=3s2 + 27.If the price he receives for repairing a car is 30， then in the long run， how many cars will he fix perweek if he maximizes profits？
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Monopoly is（）.