Files can be lost or destroyed accidentally. Keep(72)copies of all data on removable storage media。

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问题 Files can be lost or destroyed accidentally. Keep(72)copies of all data on removable storage media。

选项 A、back
B、black
C、backdown
D、backup

答案D

解析 文件有时可能会丢失或损坏,请把所有数据复制到可移动的存储设备中。
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