৩০.১১.২০২০। ক্লাস-১৫: একাদশ। উৎপাদন ব্যবস্থাপনা ও বিপণন। ১ম পত্র, ২য় অধ্যায়: শ্রম বিভাগ ও গতিশীলতা

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