Lub rooj granite XY, tseem hu ua granite nto phaj, yog ib qho kev ntsuas qhov tseeb uas feem ntau siv hauv kev tsim khoom thiab kev lag luam engineering.Nws yog ib lub tiaj tiaj, theem rooj ua los ntawm granite, uas yog cov khoom ntom ntom, tawv, thiab cov khoom siv ruaj khov uas tiv taus t ...
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