用建立多个副本来保护文件的办法适用于
A.防止天灾人祸造成的破坏
B.防止系统故障造成的破坏
C.防止用户共享文件时造成的破坏
D.防止计算机病毒的侵害造成的破坏
E.防止黑客恶意入侵造成的破坏
正确答案是AB
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