bsnl presentation training
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http://en.wikipedia.org/wiki/Optical_fibrehttp://en.wikipedia.org/wiki/Optical_fibrehttp://en.wikipedia.org/wiki/Wirehttp://en.wikipedia.org/wiki/Telephone_line -
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http://electronics.howstuffworks.com/question309.htmhttp://electronics.howstuffworks.com/speaker.htm -
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http://electronics.howstuffworks.com/question400.htm -
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