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[单选题]
16．电子邮件系统由3个主要部分组成，他们是
A
A．用户代理、邮件服务器和客户机B．用户代理、邮件服务器和简单邮件输协议(SMTP)C．用户代理服务器、邮件服务器和接收服务器D．用户代理服务器、邮件服务器和客户机
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试题答案：
B
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