Ntim cov tshuaj txhuam hniav hauv cov raj hlau ua kom nws yooj yim dua los tsim thiab faib. … Ib yam li cov raj ntawm cov xim, cov raj qub rau cov tshuaj txhuam hniav yog ua los ntawm cov hlau lead. Nrog rau tag nrho cov txiaj ntsig ntawm lub raj collapsible, tau txais qhov kawg ntawm cov tshuaj txhuam hniav tawm ntawm lub raj tseem yog ib qho teeb meem tsis yooj yim.
Cov tshuaj txhuam hniav qub puas muaj cov hmoov lead?
thawj cov tshuaj txhuam hniav yog ua los ntawm cov tin thiab txhuas, thiab tseem zoo ib yam mus txog thaum muaj hlau tsis txaus thaum Ntiaj Teb Tsov Rog II. Pawg Tswj Xyuas Kev Ua Tsov Rog txwv tsis pub cov neeg siv khoom siv ntau hom hlau, suav nrog tin, txhuas thiab txhuas, tsim kom muaj kev kub ntxhov hauv kev lag luam tshuaj txhuam hniav.
Cov tshuaj txhuam hniav yog dab tsi yog tsim los ntawm?
Cov tubes thaum ntxov tshaj plaws tau ua los ntawm tin, zinc, lossis txhuas, qee zaum coated nrog siv quav ciab rau sab hauv. Aluminium tube caps thiab kaw feem ntau yog threaded, zoo li lub nozzle. Cov raj txhuas feem ntau muaj qhov kawg nkaus folded ob peb zaug tom qab cov ntsiab lus tau ntxiv.
Thaum twg cov tshuaj txhuam hniav hloov los ntawm hlau mus rau yas?
Los ntawm xyoo 1950, cov tuam ntxhab tau tsim cov raj yas rau cov tshuaj pleev thaiv hnub, tab sis cov raj polyethylene no ua rau cov khoom xyaw tshuaj txhuam hniav. Txhua cov tshuaj txhuam hniav yas tau qhia hauv xyoo 1990, thaum lub sijhawm ntawd muaj lwm tus menyuam yaus ntawm qhov thaiv - lub twj tso kua tshuaj txhuam hniav.
Vim li cas cov tshuaj txhuam hniavphem?
Txhua ib xyoos, 1.5 billion cov tshuaj txhuam hniav xaus rau hauv qhov chaw pov tseg thiab cov yas hauv cov raj xav tau 500 xyoo kom degrade. Qhov ntawd txhais tau hais tias kev txhuam koj cov hniav txhua hnub ua rau cov yas hauv qhov chaw pov tseg thiab hauv dej hiav txwv hauv txoj kev loj, tab sis peb tsis tuaj yeem tso tseg kev txhuam hniav, yog li peb yuav ua li cas?
