Chemistry · Acids, Bases and Salts
दंत क्षय (tooth decay) आमतौर पर किस pH स्तर पर शुरू होता है?
- 18.0 से ऊपर
- 24.0 से नीचे
- 37.0 से ऊपर
- 45.5 से नीचे✓
सही उत्तर देखें
5.5 से नीचे
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