●The (75) has several major components，including the system kernel,a memory management system,the file system manager,device drivers，and the system libraries.
(75) A．application
B．information system
C．network
D．operating system
●The (75) has several major components，including the system kernel,a memory management system,the file system manager,device drivers，and the system libraries.
(75) A．application
B．information system
C．network
D．operating system
D【解析】操作系统有几个主要组成部分，主要包括系统内核、内存管理、文件系统管理、设备驱动管理和系统库等。
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