railway RRB ALP (CBT 1 + CBT 2 + CBAT) Mock Test Series 2025 (New) General Science Chemistry

నోటి pH దీని కంటే తక్కువగా ఉన్నప్పుడు దంత క్షయం ప్రారంభమవుతుంది:

1
5.7
2
5.5
3
5.6
4
5.4
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