Galvanized hlau hlau yog ntau dua nyob rau hauv peb lub neej, nws yog dav siv nyob rau hauv kev tsim kho, laj kab, nuv net, cov khoom ntim thiab lwm yam liaj teb, tab sis tom qab ib tug ntev lub sij hawm ntawm kev siv, tej zaum peb yuav pom galvanized hlau hlau blackened, hais tias qhov teeb meem no. yuav zam tau li cas?Galvanized hlau hlau blackeni...
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