单项选择题

The typical firewall consists of two packet filters and a (an)

A． router
B． bridge
C． application
D． server
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单项选择题
计算机具有灵活性和通用性特征，能求解各种不同的计算和逻辑问题，这主要是取决于计算机的
A． 快速运算
B． 指令系统
C． 可编程性
D． 输入输出设备
单项选择题
A disk scheduling mechanism in an operatingsystem causes the disk arm to sweepback and forth across the disk surface servicing all requests in its path. This is a
A． First Come First Serve
B． Shortest Seek Time First
C． Scan
D． None of the above
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