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【单选题】
下列关于GRE VPN描述，不正确的是（ ）？A.
在任意一种网络协议上传送任意一种其它网络协议的封装方法。
B.
GRE封装的载荷协议可以是IP，也可以是IPX。
C.
GRE VPN实现了保密性和完整性。
D.
GRE VPN可以实现两个私有网络之间跨越公网的通信。
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举一反三
【单选题】Although the dream of the home robot has not died, robots have had their greatest impact in factories. Unimate, the first industrial robot, went to work for General Motors in 1961. Even at a time when...
A.
the first robot of the world was designed in 1961 for General Motors
B.
the expensive computing power didn't hinder a robot's efficiency
C.
robots controlled by computers can do most tasks better than humans
D.
human workers often went on a strike when they were not satisfied in the past
【简答题】(2014)internet起源于ARPAnet,它使用的通信协议是__________
【单选题】The goals of this project are to promote the commercialization of home-use robots, whose market is smaller than _______ for industrial robots, and to develop safety technologies and standards. [ ]
A.
it
B.
them
C.
that
D.
one
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