单项选择题

The（）is a collection of modules serving as interface between hardware and software to provide a software platform.

A．computer
B．processor
C．application software
D．operating system

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单项选择题
The line of computing jobs waiting to be run on a computer system might be a （）.The jobs are serviced in the order of their arrival,that is ,the first in is the first out.

A．queue
B．stack
C．array
D．record
单项选择题
某主机的IP 地址为 10.100.100.01 20，其子网掩码是（）。

A．255.255.248.0
B．255.255.252.0
C．255.255.240.0
D．255.255.255.0
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