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  1. ... and planned noise sensitive receivers such as residential dwelling and schools are protected from excessive traffic noise. This...

  2. ..., the variability of bacteria in terms of shape, size, dwelling place, feeding habit and surviving requirements is...

  3. 1.(a) Apparent frequency = 9.05 x (343/(343 - 12.1) kHz = 9.38 kHz (b) Reflected frequency = 9.38 x (343 + 12.1)/343 kHz = 9.71 kHz (c) Apparent frequency = 9.05 x (343 + 12.1)/(343 - 12.7) kHz = 9.73 kHz (d) Reflected frequency = 9.73 x (343...

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