Make( ) copies of important files，and store them on separate locations to protect your information．

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问题 Make( ) copies of important files，and store them on separate locations to protect your information．

选项 A、back
B、back—up
C、back—out
D、background

答案B

解析对重要文件要做备份，存储在别处，以保护您的信息。

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信息处理技术员上午基础知识考试

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