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The most important system software is.
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In Windows OS, in order to open the Start Menu, the shortcut is
One famous OS of smart phone is.
One means of implementing time-sharing is to apply the technique called,in which time is divided into intervals and then the execution of each job is restricted to only one interval at a time.
1．证券公司在英国称投资银行，欧美大陆称之为商人银行。
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