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Pem Teb Uas Muaj Zog Siab
Piv nrog rau cov plag tsev cement ib txwm muaj, qhov kev ua tau zoo ntawm lub plag tsev no tau nce 3 zaug, qhov nruab nrab ntawm qhov muaj peev xwm thauj khoom ib square meter tuaj yeem tshaj 2000kgs, thiab qhov tsis kam ntawm qhov tawg tau nce ntau dua 10 zaug.
