railway RRB ALP (CBT 1 + CBT 2 + CBAT) Mock Test Series 2025 (New) Fireman Fire Fighting Equipments Fire Extinguishers

Potassium is the main element used in ____

1
Wet chemical Extinguishing System
2
Dry chemical Extinguishing System
3
Carbon Dioxide Extinguishing System
4
Foam Extinguishing System
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