প্রশ্ন ও উত্তর
Water hardness is mainly due to the presence of the following in water
সাধারণ বিজ্ঞান পানির খরতা 02 Oct, 2020
প্রশ্ন Water hardness is mainly due to the presence of the following in water
সঠিক উত্তর
Calsium & Magnesium salt
মন্তব্য
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