摘要： This lecture provides the WLAN hardware engineer the essential knowledge of IEEE 802.11 a/b/g physical specification and the basic skill of how to do 阅读全文

摘要： The world lost seven astronauts of Space Shuttle Columbia(哥伦比亚号航天飞机) this month. It broughthome the serious risk that 1humans face into the hostile en 阅读全文

摘要： Just 33 minutes into the New Year, NASA's New Horizons probe made space exploration history, flying by the most distant body ever visited by a spacecr 阅读全文