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Which of the following phenomena is taking place when sound waves are reflected from a surface along parallel lines? A. Focusing B. Diffusion C. Refracting D. Absorption
Refracting is taking place when sound waves are reflected from a surface along parallel lines.
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Shey091808|Points 395|
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Asked 9/23/2012 10:49:13 AM
Updated 11/28/2016 11:15:59 PM
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This answer has been confirmed as correct and helpful.
Edited by Andrew. [11/28/2016 11:15:58 PM], Confirmed by Andrew. [11/28/2016 11:15:59 PM]
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The most important contribution the Mongols made to encouraging trade along the Silk Roads was A. building a permanent road. B. providing security. C. lowering taxes for merchants. D. building permanent inns for travelers.
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The most important contribution the Mongols made to encouraging trade along the Silk Roads was providing security.
Added 8/15/2016 1:53:08 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [8/16/2016 4:48:30 AM]
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