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

নীচের কোনটি সবচেয়ে শক্ত (কঠিনতম) ধাতু?

1
লোহা
2
প্লাটিনাম
3
টংস্টেন
4
হীরা
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