Cathode Ray Rube (সি আর টি) কি ?

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    Administrator Member Since Oct 2016
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    Oct 31, 2012 07:19 AM 1 Answers
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    AnswersBD Administrator Nov 09, 2012 10:05 AM
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    যে টিউবের মধ্যে এক্সরে উত্‍পন্ন হয় সেটা

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