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东北地区最早和中原地区交往的民族是（）。
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单选题Your company has a main office and two branch offices. Domain controllers in the main office host an Active Directory-integrated zone. The DNS servers in the branch offices host a secondary zone for the domain and use the main office DNS servers as the DNS Master servers forthe zone. Each branch office has an application server. Users access the application server by using its fully qualified domain name. You need to ensure that users in the branch offices can access their local application server even if the WAN links are down for three days. What should you do？（）A
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Configure the Zone Aging / Scavenging Properties dialog box to enable Scavenge stale resource records， and set the Refresh setting to 4 days.D
Configure the Zone Aging / Scavenging Properties dialog box to enable Scavenge stale resource records， and set the No-refresh interval setting to 4 days.
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单选题某公司采用期望现金流量法估计未来现金流量，20×1年A设备在不同的经营情况下产生的现金流量分别为：该公司经营好的可能性是50%，产生的现金流量为60万元;经营-般的可能性是30%，产生的现金流量是50万元;经营差的可能性是20%，产生的现金流量是40万元。则该公司A设备20×1年预计的现金流量为（ ）。A
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