A________________ is a copy ofa file foruse in the event offailure or loss ofthe original.

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问题 A________________ is a copy ofa file foruse in the event offailure or loss ofthe original.

选项 A、second storage
B、buffer
C、backup
D、database

答案C

解析 备份是文件的拷贝,在原件损坏或丢失时使用。
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