搜尋結果
2 天前 · The United Nations Educational, Scientific and Cultural Organization (UNESCO) is a specialized agency of the United Nations (UN) with the aim of promoting world peace and security through international cooperation in education, arts, sciences and culture. It has 194 member states and 12 associate members, as well as partners in the non-governmental, intergovernmental and private sector.
4 天前 · Heathrow Airport (/ ˌ h iː θ ˈ r oʊ, ˈ h iː θ r oʊ /), called London Airport until 1966 (IATA: LHR, ICAO: EGLL), is the main international airport serving London, the capital of England and the United Kingdom.It is the largest of the six international airports in the London airport system (the others being Gatwick, City, Luton, Stansted and Southend).
1 天前 · Laplace transform. In mathematics, the Laplace transform, named after Pierre-Simon Laplace ( / ləˈplɑːs / ), is an integral transform that converts a function of a real variable (usually , in the time domain) to a function of a complex variable (in the complex-valued frequency domain, also known as s-domain, or s-plane ).
1 天前 · Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of channels numbered at 5 MHz spacing (except in the 45/60 GHz band, where they are 0.54/1.08/2.16 GHz apart) between the centre frequency of the channel.
1 天前 · Cisco Systems, Inc. (using the trademark Cisco) is an American multinational digital communications technology conglomerate corporation headquartered in San Jose, California.Cisco develops, manufactures, and sells networking hardware, software, telecommunications equipment and other high-technology services and products. ...
1 天前 · Charlemagne [b] ( / ˈʃɑːrləmeɪn, ˌʃɑːrləˈmeɪn / SHAR-lə-mayn, -MAYN; 2 April 748 [a] – 28 January 814) was King of the Franks from 768, King of the Lombards from 774, and Emperor of what is now known as the Carolingian Empire from 800, holding all these titles until his death in 814. Charlemagne succeeded in uniting the ...
2 天前 · 7-Eleven, Inc.[2] is an American convenience store chain, headquartered in Irving, Texas and owned by Japanese company Seven & I Holdings through Seven-Eleven Japan Co., Ltd.[3] The chain was founded in 1927 as an ice house storefront in Dallas. It was named Tote'm Stores between 1928 and 1946. After Ito-Yokado, a Japanese supermarket chain ...
