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问题
单项选择题
CTC中心、车站的网络系统应采用双网冗余结构,关键设备应为()
A.双机热备
B.2×2取2
C.3取2
D.双机冷备
答案
参考答案:
A
选择题
You can hardly imagine the difficulty Mrs. Jones had _____ up her children.
A. brought
B. to bring
C. bringing
D. to have brought
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问答题 简答题
室温到底是几度?
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