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... oduction of cement.
He pursed his lips and furrowed his brow, looking troubled. After all, cement was not something that could be easily produced.
Cement was one of the most common building materials, essential for construction.
[Generally, cement is divided into three types: ordinary silicate cement, silicate cement with mixed materials, and special cement…] Su Bai thought with a frown.
He picked up the cup on the table, about to take a drink when he realised it ...
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