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【判断题】
硝化过程中，每氧化一个铵离子转化为硝酸根离子要释放2个H+，是引起土壤酸化的重要原因A.
正确
B.
错误
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举一反三
【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.
【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
【简答题】机器人系统之间的电缆线分2类：系统内部的电缆线连接和 的电缆线连接。
【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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