题目内容
（请给出正确答案）
●An operating system is (74) .
(74) A． the highest layer of software
B． the lowest layer of software
C． the highest layer of hardware
D． the lowest layer of hardware
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更多“●An operating system is （74) .…”相关的问题
（）is a single-user multi-task operating system .
A.MS-DOSB.WindowsC.UNIXD.Linux
A.resource management
B.memory management
C.error recovery
D.all the above
A．fragmentation
B．compaction
C．swapping
D．paging
A.To avoid confusion and duplication of upgrades between applications and the operating system
B.To enhance security by modifying permissions for each resource as needed
C.To restrict users from accidentally overwriting critical files (if they fill their home directories to capacity), which makes the operating system vulnerable to hacker attacks
D.To keep the operating system partition from becoming overwhelmed with user program libraries and DLLs
The operating system has several major components，including the(64)，a memory management system，the file system manager，device drivers，and the system libraries．
A．application kernel
B．information kernel
C．network kernel
D．system kernel
A.Windows2003
B.Office2003
C.WindowsXP
D.Linux
A.Securing the system
B.Operating system hardening
C.Auditing
D.System maintenance
