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【简答题】
常用的数据备份方式包括完全备份 、 增量备份和差异备份 ， 三种方式在空间使用方法由多到少的顺序为 A) 完全备份、增量备份、差异备份 B) 完全备份、差异备份、增量备份 C) 增量备份、差异备份、完全备份 D) 差异备份、增量备份、完全备份
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举一反三
【简答题】We should ______ when we receive a suspicious letter.
【单选题】__________ we had read your letter __________ the true state of affairs.
A.
It was until; that we understood
B.
It was not until; we understood
C.
Until; did not we understood
D.
Not until; did we understood
【简答题】From the letter，we can know＿＿＿．
【单选题】______ an answer, he decided to write another letter to them.
A.
Receiving
B.
Not being received
C.
Having not received
D.
Not having received
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