railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Equilibrium

নিম্নলিখিত কত pH মাত্রার মধ্যে মানবদেহ কাজ করে?

1
6.0 থেকে 7.0
2
6.0 থেকে 6.8
3
7.0 থেকে 7.8
4
7.0 থেকে 8.6
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