লেকচার-২০, লেহিত রক্তকণিকার গঠন। জীববিজ্ঞান, ২য় পত্র,অধ্যায় -৪,০২/০২/২১ তারিখের। জীববিজ্ঞান, একাদশ শ্রেনী।

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