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    大華高科(股)公司- 噪音計 - KIMO台灣總代理商

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  2. en.wikipedia.org › wiki › Speed_of_soundSpeed of sound - Wikipedia

    The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 °C (68 °F), the speed of sound in air is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn ), or 1 km in 2.91 s or one mile in 4.69 s. It depends strongly on temperature as well as the medium through which a ...

  3. en.wikipedia.org › wiki › Radio_noiseRadio noise - Wikipedia

    Radio noise. In radio reception, radio noise (commonly referred to as radio static) is unwanted random radio frequency electrical signals, fluctuating voltages, always present in a radio receiver in addition to the desired radio signal. Radio noise near in frequency to the radio signal being received (in the receiver's passband) interferes with ...

  4. en.wikipedia.org › wiki › Mach_numberMach number - Wikipedia

    where the Mach number = /.In the limit that , the continuity equation reduces to = — this is the standard requirement for incompressible flow. Classification of Mach regimes While the terms subsonic and supersonic, in the purest sense, refer to speeds below and above the local speed of sound respectively, aerodynamicists often use the same terms to talk about particular ranges of Mach values.

  5. en.wikipedia.org › wiki › Airbus_A350Airbus A350 - Wikipedia

    The Airbus A350 is a long-range, wide-body twin-engine airliner developed and produced by Airbus. The initial A350 design proposed by Airbus in 2004, in response to the Boeing 787 Dreamliner, would have been a development of the Airbus A330 with composite wings and new engines. Due to inadequate market support, Airbus switched in 2006 to a ...

  6. en.wikipedia.org › wiki › Lockheed_Martin_F-35_Lightning_IILockheed Martin F-35 Lightning II - Wikipedia

    2006–present. Number built. 1,000+ [4] Developed from. Lockheed Martin X-35. The Lockheed Martin F-35 Lightning II is an American family of single-seat, single-engine, stealth multirole combat aircraft designed for air superiority and strike missions; it also has electronic warfare and intelligence, surveillance, and reconnaissance capabilities.

  7. en.wikipedia.org › wiki › Richter_scaleRichter scale - Wikipedia

    v. t. e. The Richter scale [1] ( / ˈrɪktər / ), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Francis Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it ...

  8. en.wikipedia.org › wiki › The_Sound_of_SilenceThe Sound of Silence - Wikipedia

    "The Sound of Silence" (originally "The Sounds of Silence") is a song by the American folk rock duo Simon & Garfunkel, written by Paul Simon. The duo's studio audition of the song led to a record deal with Columbia Records, and the original acoustic version was recorded in March 1964 at Columbia's 7th Avenue Recording Studios in New York City for their debut album, Wednesday Morning, 3 A.M ...

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