问题
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
答案
参考答案：A
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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
参考答案：A