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  2. Propagation of sound in the medium is defined as the longitudinal wave. When the sound waves by the large size of its wavelength blocking occurs when the object reflected, the reflected wave is called echo. If the sound wave propagation speed in the
  3. 所属分类:单片机(51,AVR,MSP430等)

    • 发布日期:2025-07-19
    • 文件大小:1266688

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