实现对零件的切削加工需要哪些基本运动，它们在切削中的作用是什么？对于车削、铣削、刨削加工来说，主运动是什么？
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our company has a domain controller that runs Windows Server 2008 R2 and the DNS role.The DNS domain is named contoso.com.You need to ensure that inquiries about contoso.com are sent to dnsadmin@contoso.com. What should you do？（）
A. Create a Signature (SIG) record for the domain controller.
B. Modify the Name Server (NS) record for the domain controller.
C. Modify the Service Location (SRV) record for the domain controller.
D. Modify the Start of Authority (SOA) record on the domain controller.
对残疾、老年旅客，（）为他们提供方便
A. 尽可能的
B. 必须
C. 视情况
D. 可以
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