单选
● 按照域名系统的定义，域名www.sales.micosoft.com包含4个标识符，其中 （62） 是顶级域名， （63） 是注册给组织或个人的二级域名。
（62）
- A. www
- B. sales
- C. micosoft
- D. com （63）
- A. www
- B. sales
- C. micosoft
- D. com
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