I. Nta: 1. upvc yeeb nkab, tseem hu ua nyuaj polyvinyl chloride yeeb nkab, u-pvc yeeb nkab, yog ib hom muaj zog corrosion kuj, acid, alkali ntsev roj nruab nrab erosion kuj, lub teeb yuag, ib tug tej yam mechanical zog, zoo hydraulic tej yam kev mob. , yooj yim installation, tab sis yooj yim rau kev laus, siab te ...
Nyeem ntxiv