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发生高压对地故障时，在切断电源前，任何人与接地点的距离，室外不得小于多少米？

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某公司网络的地址是202.100.192.0/20，要把该网络分成16个子网，则对应的子网掩码应该是（）

A. 255.255.240.0
B. 255.255.224.0
C. 255.255.254.0
D. 255.255.255.0

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区域物流载体是区域物流的组成要素之一，以下选项中不属于区域物流载体建设的是（）。

A. 物流企业信息系统
B. 基础设施
C. 物流活动设施设备
D. 物流标准

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角色从不同的标准可以区分为先赋形角色和获得性角色，（），经常性角色和依赖性角色。

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Your company has a Berkley Internet Name Domain (BIND) DNS server named Server1 that hosts the contoso.com DNS zone. You plan to replace Server1 with a DNS server named Server2 that runs Windows Server 2003 Service Pack 2 (SP2). You need to configure DNS on Server2 to meet the following requirements: Retain all resource records currently in the contoso.com zone.Allow updates to resource records for the contoso.com zone on Server2. What should you do? （）

A. On Server2, configure a primary zone for contoso.com.
B. On Server2, configure a secondary zone for contoso.com. Configure the contoso.com zone on Server2 as a primary zone.
Copy the contoso.com.dns file from Server1 to the %systemroot%\System32\DNS folder on Server2. On Server2, restart the DNS Server service.
D. Copy the contoso.com.dns file from Server1 to the %systemroot%\System32\DNS folder on Server2. On Server2, create a secondary zone for contoso.com.

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