15.1. Cov hau kev los tiv thaiv kev tsim ntawm cov xeb dawb yog li hauv qab no

(1) thaum lub sijhawm cia, Galvanized steel kav yuav tsum tau muab khaws cia kom muaj hws thiab nyob hauv tshav kub;

(2) Cov chaw khaws khoom yuav tsum muaj kev ntsuas cua kom zoo, nrog cov av noo kom huv ntawm 60% rau 95%;

(3) Zam kev nyiag nyob hauv thaj chaw nrog cov pa roj teeb lossis cov plua plav;

(4) Thov cov txheej txheem tiv thaiv xws li roj, kev kho mob hla dhau los, lossis cov organic txheej rau cov nplaim hluav taws xob galvanized.