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【单选题】
调节体温的基本中枢位于A.
脊髓
B.
延髓
C.
脑桥
D.
中脑
E.
下丘脑
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反馈参考答案：
举一反三
【单选题】Barriers to entry can be the result of
A.
Positive network externalities
B.
High switching costs
C.
Economies of scale
D.
All of the above
【单选题】Which of the following are barriers to entry into a market:
A.
legal restrictions.
B.
high cost of entry.
C.
advertising cost.
D.
all of the above.
【简答题】进入壁垒(政府的与经济的)[barriers to entry(government and economic)]
【单选题】Which of the following could not create barriers to entry?
A.
Negative network externalities
B.
Ownership of essential inputs
C.
Economies of scale
D.
All of the above could create barriers to entry
【单选题】社会主义基本经济制度在中国全面建立的标志是（）
A.
1949年新中国成立
B.
1952年国民经济基本恢复
C.
1956年社会主义改造基本完成
D.
1953年“一五”计划开始实施
【单选题】The level of entry barriers is only relevant to potential competitors because:
A.
Firms that are established in an industry have already overcome the barriers to entry.
B.
The existence of high entry barriers has little impact on overall industry profitability.
C.
Competitive markets are dynamic, so established firms expect that there will always be new entrants.
D.
The level of entry barriers is relevant to both existing and potential firms due to the competitive consequences for both.
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