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प्रश्न
What are the similarities between Modem cement and ancient cement.
समानताएं
उत्तर
Both modern and ancient cement harden through hydration, in which the cement combines with water to form a hard, stone-like material. Both modern and ancient cement are highly regarded for their durability.
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अध्याय 4.5: Materials we Use - Exercise [पृष्ठ ९७]
