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热金属、熔融玻璃、强发光体等红外线辐射源属于非电离辐射。

A. 正确
B. 错误

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You are a network administrator for your company. The network consists of a single Active Directory domain. All domain controllers and member servers run Windows Server 2003， Enterprise Edition. All client computers run Windows XP Professional. The company has one main office and one branch office. The two offices are connected by a T1 WAN connection. There is a hardware router at each end of the connection. The main office contains 10，000 client computers， and the branch office contains 5，000 client computers. You need to use DHCP to provide IP addresses to the Windows XP Professional computers in both offices. You need to minimize network configuration traffic on the WAN connection. Your solution needs to prevent any component involved in the DHCP architecture from becoming a single point of failure. What should you do？（）

At the main office， configure two Windows Server 2003 computers as a DHCP server cluster. Configure the branch office router as a DHCP relay agent.
B. At the main office， configure two Windows Server 2003 computers as a DHCP server cluster. At the branch office， configure a Windows Server 2003 computer as a DHCP relay agent.
C. At the main office， configure two Windows Server 2003 computers as a DHCP server cluster. At the branch office， configure two Windows Server 2003 computers as a DHCP server cluster.
D. At the main office， configure two Windows Server 2003 computers as DHCP servers. Configure one DHCP server to handle 80 percent of the IP address scope and the other DHCP server to handle 20 percent. Configure the branch office router as a DHCP relay agent.

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