题目内容

VPN,也就是虚拟专用网络,指的是在公用网络上建立专用网络的技术。

A. 正确
B. 错误

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If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?()

A. The wearing rings are excessively worn
B. The suction strainer is clogged
C. The discharge valve is clogged
D. The shaft is wor

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