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在当前的云计算领域，Google的（）和Hadoop开发的开源系统（）是比较流行的两种云计算分布式存储系统。（填英文缩写）

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MapReduce模式将任务自动分成多个子任务，通过Map和Reduce两步，实现任务在大规模计算节点中的调度与分配。

A. 对
B. 错

[单选]One way in which monopolistic competition differs from oligopoly is that

A. there are no barriers to entry in oligopolies.
B. in oligopoly markets there are only a few sellers.
C. all firms in an oligopoly eventually earn zero economic profits.
D. strategic interactions between firms are rare in oligopolies.

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[单选]A profit-maximizing firm in a monopolistically competitive market is characterized by which of the following?

A. marginal cost exceeds marginal revenue
B. average revenue equals marginal cost
C. price exceeds marginal cost
D. All of the above are correct.

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[单选]In monopolistically competitive markets, positive economic profits

A. suggest that some existing firms will exit the market.
B. suggest that new firms will enter the market.
C. are sustained through government-imposed barriers to entry.
D. are never possible.

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