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We get minerals and ores in abundance in the earth’s crust. Some ores have been proven themselves a great resource for mankind. Such as ir...
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ल विद्यार्थी हरु आज म ph सम्बन्धी केही ज्ञान प्रस्तुत गर्न गै रहेको छु। आखिर के हो त ph भनेको? हामीलाई थाहा नै छ कि कुनै पनि solution को aci...
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