填空题 An ____facilitates the execution of other software, acts as the general manager of computer system, and ensures the efficient use of hardware and software.
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填空题 The operation system oversees the ____manager, the ____manager, the device manager, the file manger, and the user interface.
填空题 In ____, most of memory capacity is dedicated to one single program.
填空题 In ____, more than one program is in memory at the same time.
填空题 In ____, memory is divided into variable length sections, each of which holds one program.