Teaching Jharkhand (JSSC) PRT (1 to 5) Mock Test 2023 Engineering Materials Science Structure and Properties of Engineering Materials Properties of Materials

खालीलपैकी सर्वात कठोर धातू कोणता आहे?

1
सोने
2
लोह
3
प्लॅटिनम
4
टंगस्टन
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