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高速电子与阳极靶物质发生相互作用时（）
黑龙江省有“（ ）”之称，是全国最大的木材生产基地。
链球菌分类依据是（ ）。
You are the systems engineer for Contoso， Ltd. The internal network consists of a Windows NT 4.0 domain. The company maintains a separate network that contains publicly accessible Web and mail servers. These Web and mail servers are members of a DNS domain named contoso.com. The contoso.com zone is hosted by a UNIX-based DNS server running BIND 4.8.1. Contoso， Ltd.， is planning to migrate to a Windows Server 2003 Active Directory domain-based network. The migration plan states that all client computers will be upgraded to Windows XP Professional and that all servers will be replaced with new computers running Windows Server 2003. The migration plan specifies the following requirements for DNS in the new environment： • Active Directory data must not be accessible from the Internet. • The DNS namespace must be contiguous to minimize confusion for users and administrators. • Users must be able to connect to resources in the contoso.com domain. • Users must be able to connect to resources located on the Internet. • The existing UNIX-based DNS server will continue to host the contoso.com domain. • The existing UNIX-based DNS server cannot be upgraded or replaced. You plan to install a Windows Server 2003 DNS server on the internal network. You need to configure this Windows-based DNS server to meet the requirements specified in the migration plan. What should you do？ （）
如果某一回归方程的相关系数r小于临界值r（β，n－2），下列说法（）成立。
欲测量200V电压，要求测量示值相对误差不大于±0.5%，问选用量程为250V电压表，其精度为那一级？若选用量程为500V或750V的电压表，其精度又分别为那一级？
取消医师抗菌药物处方权的情形不包括（）。
售中服务的内容包括（）
（）是肠外营养唯一的氮源（）
下面属于有形采购的一项是（）
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