未知题型
某一电子邮件地址为dengjikaoshi@sin
- A.com，其中dengjikaoshi代表______。
A．用户名
B．主机名
C．域名
D．文件名
【参考答案】
A
解析：电子邮件的基本格式为＜用户标识＞＜主机域名＞，题中dengjikaoshi为用户标识，即用户名。
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