Cov ntsia hlau niaj hnub xav tau txhais tes rau rauj, ua haujlwm hnyav thiab siv sijhawm, thiab tsis txaus, yooj yim dua raug ntaus, thiab cov ntsia hlau dov roj tshem tawm tag nrho cov kev tsis txaus no.
Tus qauv tsim ntawm tus ntsia thawv yog qhov tsim nyog, yog vim li cas rau tib neeg txais tos, tus qauv tsim ntawm tus ntsia thawv yog tshiab thiab siv dav, nws yog qhov zoo tshaj plaws hloov cov ntsia hlau puag ncig.
Dav siv dav hauv kev tsim kho, kho kom zoo nkauj, kho kom zoo nkauj, kho kom zoo nkauj, tsis muaj ntsia hlau taub hau ntsia hlau, tsis muaj cov ntsia hlau tom qab tso, cov yam ntxwv tsim nyog rau kev lag luam kho kom zoo nkauj. Nws yog tsuas yog siv rau cov rooj tog zaum thiab ntau yam khoom siv ntoo, thiab cov rooj tog tsim kev lag luam yog siv rau cov rooj zaum rooj zaum, cov xuab zeb tawm thiab tawv. Kev lag luam kho kom zoo nkauj yog siv rau qab nthab, daim ntawv, thiab lwm yam, thiab lub thawv ntoo kev lag luam yog siv rau cov ntawv sab nrauv cement steel ntsia hlau nyob rau hauv tsos zoo li cov ntsia hlau puag ncig, lub taub hau yog me ntsis thicker, thiab nws yog haum rau cov mos mos thiab tawv ntoo, xyoob qhov chaw, cov yas zoo tib yam, lub ntiaj teb phab ntsa xuab zeb, kho rooj tog, ntim cov thawv ntoo, thiab lwm yam.
Daim ntawv thov ntawm daim ntawv thov ntawm cov ntsia hlau yog dav heev, thiab cov teb koom nrog kuj muaj ntau haiv neeg, yog li nws txoj kev lag luam loj heev thiab kev loj hlob sai heev.
