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চ্যালকোজেন শব্দের অর্থ কী?

Md. Saifur Rahman

চ্যালকোজেন শব্দের অর্থ হলো আকরিক উৎপন্নকারী।

Unknown ১২ জুন, ২০২১ এ ১২:৪৯ AM

চালকোজেন কী

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