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单选题
Which of the following computer recovery sites is the least expensive and the most difficult to test? 以下哪项计算机恢复站点是最便宜的和最难测试的?()
A

non-mobile hot site. 非移动热站

B

cold site. 冷站

C

warm site. 热站

D

mobile hot site. 移动热站


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