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asdfkla asdfkla
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6 years ago
A smooth, dense wall of painted concrete:
 
   Reflects all the sound striking its surface
   Reflects only a small percentage of sound
  striking its surface
   Absorbs only a small percentage of sound striking
  its surface
   Absorbs all of the sound striking its surface
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dgonzalez228dgonzalez228
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6 years ago
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