单项选择题

良好的硬件环境是保证电子商务系统安全稳定运行的重要基础。

A.正确
B.错误

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The absolute purchasing-power parity theory postulates that the equilibrium exchange rate between two currencies is equal to the ratio of the price levels in the two nations. ()

答案：正确

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答案：运转状态；连续；短时；周期断续