Lub thawv Culvert Formwork
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Lub thawv Culvert Formwork
Lub thawv culvert formwork yog ib qho kev daws teeb meem kev tsim kho uas tau tsim los rau cov qauv culvert, cov kab ke dej ntws, thiab cov haujlwm choj me. Tsim los kom ua haujlwm tau zoo thiab ruaj khov, nws txhawb nqa ntau yam kev xav tau ntawm cov qauv hauv ntau daim ntawv thov kev tsim kho vaj tse.