প্রশ্ন ও উত্তর
By what name is water which contains soluble salts of calcium and magnesium known?
সাধারণ বিজ্ঞান Basic Information of Daily Science, Inventions and... 07 Oct, 2020
প্রশ্ন By what name is water which contains soluble salts of calcium and magnesium known?
সঠিক উত্তর
hard water
মন্তব্য
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