单项选择题

Files can be lost or destroyed accidentally．Keep (74) copies of all data on removable storage medi

A．backup
B．back
C．black
D．backdo
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单项选择题
The (72) 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
单项选择题
Each program module is compiled separately and the resulting (71) files are linked together to make an executable application.
A．assembler
B．source
C．library
D．object
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