Question
| A. Tungsten | 1. Development of human civilization |
| B. Titanium | 2. Light bulb filament |
| C. Molybdenum | 3. Artificial joint |
| D. Copper | 4. Boiler plants |
✓
Answer
(A) - 2, (B) - 3, (C) - 4, (D) - 1
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| Code: | A | B | C | D |
| $i$. | a | b | c | d |
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