Cov kav dej tooj liab muaj keeb kwm ntev, raws li tau piav qhia hauv qab no:
1. Keeb kwm txheej thaum ub:
- Cov Iyiv thaum ub: ib ncig ntawm 3000 BC, cov neeg Iyiv ua tau tsim cov kav dej hauv chav ua si nrog rau cov kav dej. Cov kws tshawb fawb archaeologis tau pom tooj liab kav dej hauv Egyptian pyes hauv Eygyptian pizes hauv 4,500 xyoo dhau los uas tseem siv hnub no. Qhov no yog tam sim no yog hu ua ib qho ntawm cov ntawv sau ua tooj
- Ancient Lome: Cov neeg Loos thaum ub siv cov luam ntawv hauv dej hauv dej thiab cov cissis. Lawv tau siv tooj liab mus thauj dej, thiab siv dav hauv lub nroog cov khoom siv dej ua haujlwm, uas ua lub luag haujlwm tseem ceeb hauv kev txhim kho nroog thiab lub neej ntawm cov neeg nyob hauv nroog.
2. Kev txhim kho theem:
- Medieval thiab Renaissance: nyob rau hauv European nruab nrab hnub nyoog, daim ntawv thov tooj liab kav txuas ntxiv txhim kho, thiab nws tau siv hauv kev tsim kho, kev ua dej thiab lwm thaj teb. Nyob rau lub sijhawm renaissance, ntxiv rau hnub nyoog tooj liab hauv kev ua liaj ua teb, kuj tau siv hauv kev tsim cov twj paj nruas.
- Kev tawm tsam muaj: nrog kev tawm tsam ntawm kev tswj hwm kev lag luam, kev tsim khoom ntau lawm tau zoo dua qub, thiab cov txheej txheem ntau lawm ntawm tooj liab lub raj kuj tau txhim kho txuas ntxiv. Nyob rau lub sijhawm no, qhov zoo thiab tsim cov yeeb nkab tooj liab tau ua rau muaj kev tsim kho, tsis yog siv tau kev lag luam ib txwm muaj, tsis yog siv rau kev lag luam ib txwm muaj, tsis yog kev lag luam tawm, kev lag luam tshuaj ntxiv, kev lag luam tshuaj ntxiv, tsis muaj tshuaj lom neeg pib ua lub luag haujlwm.
3. Cov Ntawv Thov Niaj Hnub:
- Lub xyoo pua 20th: xyoo pua xyoo pua 20, tooj liab leeg nyob hauv nruab nrab cua txias thiab lwm yam khoom siv cua txias, cua sov cov khoom siv tau nce. Vim tias nws zoo thermal conductivity thiab corrosion tsis kam, tooj raj yog heev rau cov tshuab cua txias rau hauv kev thauj mus los hauv tub yees.
- LAWM 20th xyoo pua 20 mus rau tam sim no: nrog kev ua haujlwm txuas ntxiv ntawm kev tshawb fawb txuas ntxiv txhim kho, thiab nws cov kev ua tau zoo yog qhov zoo. Nyob rau tib lub sijhawm, cov tib neeg txoj kev txhim kho txuas ntxiv ntawm lub neej zoo thiab ib puag ncig cov dej xaim, yog li cov dej hluav taws xob, cua sov thiab lwm daim ntawv thov yog ntau dua thiab muaj ntau dua. Ntxiv mus, hauv lub tshuab hluav taws xob, hluav taws xob thiab lwm yam kev siv cov khoom siv hluav taws xob ntau ntxiv vim tias nws cov khoom siv hluav taws xob thiab cov khoom tseem ceeb ntawm cov khoom cua sov fittings.
