engineering recuitment BTSC Bihar JE Civil Mock Test Construction Materials and Management Bricks and Mortar

बॉक्साइट ईंटें क्या हैं?

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साधारण अग्नि ईंटें
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मूल अपवर्तक ईंटें
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अम्ल अपवर्तक ईंटें
4
उदासीन अपवर्तक ईंट
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