Yahoo奇摩 網頁搜尋

  1. 矽膠墊圈 相關

    廣告

搜尋結果

  1. en.wikipedia.org › wiki › SiliconSilicon - Wikipedia

    5 天前 · Silicon is a chemical element; it has symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster, and is a tetravalent metalloid and semiconductor. It is a member of group 14 in the periodic table: carbon is above it; and germanium, tin, lead, and flerovium are below it. It is relatively unreactive ...

  2. 5 天前 · Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO2, commonly found in nature as quartz.[5][6] In many parts of the world, silica is the major constituent of sand. Silica is abundant as it comprises several minerals and synthetic products. All forms are white or colorless, although impure samples can be ...

    • 2,950 °C (5,340 °F; 3,220 K)
    • 1,713 °C (3,115 °F; 1,986 K) (amorphous): 4.88  to
    • SiO₂
    • 60.08 g/mol
  3. 4 天前 · Silicon Valley is a region in Northern California that is a global center for high technology and innovation. Located in the southern part of the San Francisco Bay Area, it corresponds roughly to the geographical area of the Santa Clara Valley. [1] [2] [3] The term "Silicon Valley" refers to the area in which high-tech business has proliferated ...

  4. en.wikipedia.org › wiki › UltravioletUltraviolet - Wikipedia

    22 小時前 · Ultraviolet ( UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and ...

  1. 其他人也搜尋了