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● OSI is a theoretical model that shows how any two different systems can communicate with each other．Router, as a networking device, operate at the
● The connection between two networks to form. an internet is handled by a machine known as a （71） .（71）A．bridgeB．clientC．routerD．switch
●Most computer systems are (71) to two different groups of attacks:Insider attacks and outsider attacks． A system that is known to be (72) to an outs
What can we learn from the last two paragraphs?A．More time should be spent on computers.B．Children should be forbidden from watching TV.C．'IV sets sh
What can we learn from the last two paragraphs?A. More time should be spent on computers.B. Children should be forbidden from watching TV.C. TV sets
All the dishes in this menu, otherwise stated, will serve two to three people.A. as B. if C. though D. unless
What does the author mean by “it’s a two-waystreet’ in paragraph 10?A． China and India have different traffic rulesB． Tea trade works wonders in beth
– I wonder how much you charge for your services.-- The first two are free the third costs $30.A. whileB. untilC. whenD. before
Some of you may have finished unit one. _____ , you can go on to unit two.A. If you mayB. If you doC. If notD. If so
It is reported that the police will soon ____ the case of two missing children.A. look uponB. look afterC. look intoD. look out
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