单项选择题

A firewall is a (72) system designed to (73) an organization’s network aga-inst threats.

A．operating
B．programming
C．security
D．service
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单项选择题
A．中断方式B．抢占方式C．非抢占方式D．查询方式
A．中断方式
B．抢占方式
C．非抢占方式
D．查询方式
单项选择题
The (74) has several major components, including the system kernel, a memory management system, the file system manager, device drivers, and the system libraries.
A．application
B．information system
C．network
D．operating system
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