শ্রেণিঃ একাদশ, বিষয়ঃ পদার্থবিজ্ঞান ২য় পত্র, অধ্যায়ঃ তাপ গতিবিদ্যা (১), তারিখঃ০১-০৩-২০২১,মোঃ ফজলুল বারী (বারী স্যার), প্রভাষক পদার্থবিজ্ঞান বিভাগ, পুলিশ লাইন্স স্কুল এন্ড কলেজ রংপুর।

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