railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrician and Wireman Power Systems Earthing

भू-सम्पर्कन तार किस पदार्थ का बना होता है?

1
तांबा
2
एल्यूमिनियम
3
लौह
4
जस्ती इस्पात
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