SSC RSMSSB JE Mock Test 2024 Construction Materials and Management Bricks and Mortar

एक अच्छी ईंट की मिट्टी में लौह ऑक्साइड _____________की श्रेणी में होना चाहिए।

1
5 – 7%
2
12 – 15%
3
15 – 20%
4
20 – 25%
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