填空题 In ____, more than one program is in memory at the same time.
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填空题 In ____, memory is divided into variable length sections, each of which holds one program.
填空题 A program becomes a____when it is selected by the operating system and brought to the hold state.
填空题 In ____, memory is divided into equally sized sections called frames and the program is divided into equally sized sections called pages.
填空题 The sum of the sizes of all the programs in memory is ____.