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

भूमिगत केबल के कवच के लिए प्रयुक्त सामग्री है:

1
जस्ती इस्पात तार
2
लकड़ी
3
एल्युमीनियम
4
ताँबा
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