engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Electrician and Wireman Cells and Batteries

निकेल लौह बैटरी में प्रयोग किए जाने वाले विद्युत-अपघट्य ______ है|

1
एच 2 एसओ 4
2
एचसीआई
3
कोह
4
नाओएच
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