For any information system to serve its purpose,the information must be_______________when it is needed.

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问题 For any information system to serve its purpose,the information must be_______________when it is needed.

选项 A、integral
B、available
C、irreplaceable
D、confidential

答案B

解析 为了达到信息系统的目标,信息在需要时都必须具备可用性。
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