单项选择题

Insufficient ______ can cause a processor to work at 50% or even more below its performance potential.

A．mouse
B．I/O
C．document
D．memory
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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
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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