engineering recuitment ISRO Scientist Civil Mock Test Construction Materials and Management Bricks and Mortar

एक अच्छी ईंट की मिट्टी  में निम्नलिखित सीमा में एल्यूमिना होना चाहिए-

1
5 -10%
2
20 - 30%
3
40 - 50%
4
60 - 70%
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