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Business etiquette is all aboutwith __.

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When having a conversation, always give people_ . Using good eye contact and being an active listener showsand that______________.

If your tone is bossy or annoyed on the other hand, it could_________________________and make them uncooperative.

Follow the __ wherever you work and you'll likely.

以下关于VPN的说法中的()是正确的。

A. VPN是虚拟专用网的简称，它只能由ISP维护和实施
B. VPN是只能在第二层数据链路层上实现加密
C. IPSEC是VPN采用的一种技术。
D. VPN使用通道技术加密，但没有身份验证功能