...采用技术之一来实现: ①.地址学习(addresslearning) ②.生成树(spaning tree) ③.广播和发现(broadcast and discover). ④.链路状态选路(1ink state rouling) ⑤.显式信令(explicitsignaling) 在三层以太网交换机中主要用到了前四项技术。
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他发现的电磁特性最终导致电视、广播、微波炉的发明,并且也对无线电和红外望远镜的发明起到了重要作用。
His discovery of the electromagnetic spectrum led to the development of television, radio, microwaves, as well as aiding in the development of radio and infrared telescopes.
他们发现,在一年中的12个月里,由两万亿兆字节的信息会通过电视、广播、报纸、海报和邮件的方式传播出去。
They found that mankind broadcasts two quadrillion megabytes - or two followed by 21 zeroes - of information through televisions, radios, newspapers, post and emails every 12 months.
他们发现,在一年中的12个月里,由两万亿兆字节的信息会通过电视、广播、报纸、海报和邮件的方式传播出去。
They found that mankind broadcasts two quadrillion megabytes - or two followed by 21 zeroes - of information through televisions, radios, newspapers, post and emails every 12 months。
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