Cov yeeb nkab fittings muaj xws li cov kav dej khib nyiab, flues, qhov cua ducts, cov kav dej cua txias, cov kav dej thiab cov kav dej, cov kav dej, cov kav dej, cable kav, cov khoom thauj khoom, thiab lwm yam, thiab yog ib feem ntawm lub tsev. Cov yeeb nkab khib nyiab Vertical pipelines rau conveying domestic pov tseg nyob rau hauv ntau-storey thiab high-rise b ...
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