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  1. 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.

  2. 4 天前 · The Palace of Versailles ( / vɛərˈsaɪ, vɜːrˈsaɪ / vair-SY, vur-SY; [1] French: château de Versailles [ʃɑto d (ə) vɛʁsɑj] ⓘ) is a former royal residence commissioned by King Louis XIV located in Versailles, about 19 kilometers (12 mi) west of Paris, France . The palace is owned by the government of France and since 1995 has been ...

    • 1661
    • Versailles, France
    • Government of France
  3. en.wikipedia.org › wiki › MadonnaMadonna - Wikipedia

    1 天前 · Madonna Louise Ciccone[a] (/tʃɪˈkoʊni/; born August 16, 1958) is an American singer, songwriter, and actress. Nicknamed the "Queen of Pop", she has been recognized for her continual reinvention and versatility in music production, songwriting and visual presentation. Madonna's works, which incorporate social, political, sexual, and ...

  4. 4 天前 · Air pollution is the contamination of air due to the presence of substances called pollutants in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials. [1] It is also the contamination of the indoor or outdoor environment either by chemical, physical, or biological agents ...

  5. 1 天前 · Princeton University is a private Ivy League research university in Princeton, New Jersey. Founded in 1746 in Elizabeth as the College of New Jersey, Princeton is the fourth-oldest institution of higher education in the United States and one of the nine colonial colleges chartered before the American Revolution.[8][9][a] The institution moved ...

  6. en.wikipedia.org › wiki › Black_holeBlack hole - Wikipedia

    3 天前 · Black holes are commonly classified according to their mass, independent of angular momentum, J.The size of a black hole, as determined by the radius of the event horizon, or Schwarzschild radius, is proportional to the mass, M, through = , where r s is the Schwarzschild radius and M is the mass of the Sun. ...

  7. en.wikipedia.org › wiki › KatakanaKatakana - Wikipedia

    4 天前 · Katakana (片仮名、カタカナ, IPA: [katakaꜜna, kataꜜkana]) is a Japanese syllabary, one component of the Japanese writing system along with hiragana,[2] kanji and in some cases the Latin script (known as rōmaji). The word katakana means "fragmentary kana", as the katakana characters are derived from components or fragments of more ...