某系统的可用性达到99.98%，则每年系统故障时间不能超过（ ）。
- A.1小时
- B.2小时
- C.50分钟
- D.30分钟
正确答案及解析
正确答案
解析
本题考查系统故障的计算公式。
系统故障时间=每年总时间（按每分钟）*系统不可用率=每年总时间（按每分钟）*（1-系统可用率）=（365*24*60分钟）*（1-99.98%）=105（分钟）（约等于105分钟）
其中四个选项最接近的B选项2个小时，不能超过2个小时，故本题选B。
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