লেকচারঃ ০২, বিষয়ঃ ভর শক্তি সমীকরণ, শ্রেণিঃ দ্বাদশ, তারিখঃ ০১/১১/২০২০, শোয়েব, প্রভাষক পদার্থবিজ্ঞান।

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