আলোক সংকেত পাঠানোর জন্য কোনটি ব্যবহৃত হয়?

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    Oct 30, 2012 06:50 AM 3 Answers
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    AnswersBD Administrator Jul 20, 2014 04:20 PM
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    অবতল দর্পন ব্যবহৃত হয়ে থকে…………

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    AnswersBD Administrator Jul 20, 2014 04:20 PM
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    অবতল দর্পন ব্যবহৃত হয়ে থাকে…..

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    AnswersBD Administrator Nov 10, 2012 03:45 PM
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    অবতল দর্পন ব্যবহৃত হয়

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