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  1. en.wikipedia.org › wiki › Dark_matterDark matter - Wikipedia

    2024年5月23日 · History Early history The hypothesis of dark matter has an elaborate history. In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that the ...

  2. 3 天前 · ARM (stylised in lowercase as arm, formerly an acronym for Advanced RISC Machines and originally Acorn RISC Machine) is a family of RISC instruction set architectures (ISAs) for computer processors. Arm Ltd. develops the ISAs and licenses them to other companies, who build the physical devices that use the instruction set.

  3. en.wikipedia.org › wiki › AsbestosAsbestos - Wikipedia

    2 天前 · Asbestos (/ æ s ˈ b ɛ s t ə s, æ z-,-t ɒ s / ass-BES-təs, az-, - toss) is a naturally occurring fibrous silicate mineral.There are six types, all of which are composed of long and thin fibrous crystals, each fibre (particulate with length substantially greater than width) being composed of many microscopic "fibrils" that can be released into the atmosphere by abrasion and other processes.

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

    2024年5月23日 · An M.2 (2242) solid-state-drive ( SSD) connected into USB 3.0 adapter and connected to computer. The USB mass storage device class (MSC or UMS) standardizes connections to storage devices. At first intended for magnetic and optical drives, it has been extended to support flash drives and SD card readers.

  5. en.wikipedia.org › wiki › CopperCopper - Wikipedia

    3 天前 · Copper is a chemical element; it has symbol Cu (from Latin cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, and as a ...

  6. en.wikipedia.org › wiki › 5G5G - Wikipedia

    3 天前 · Wireless network technologies. In telecommunications, 5G is the fifth-generation technology standard for cellular networks, which cellular phone companies began deploying worldwide in 2019, and is the successor to 4G technology that provides connectivity to most current mobile phones. Like its predecessors, 5G networks are cellular networks, in ...

  7. 1 天前 · episodes (2005–present) Doctor Who is a British science fiction television programme produced by the BBC. As of 25 May 2024, 879 episodes of Doctor Who have aired. This includes one television movie and multiple specials, and encompasses 308 stories over 40 seasons, starting in 1963. Additionally, four charity specials and two animated ...

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