Cov neeg ua haujlwm hauv av hauv av yuav tsum hnav cov khau ua lag luam, cov neeg ua haujlwm hauv hluav taws xob hluav taws xob nuclear fais fab nroj tsuag yuav tsum tau hnav cov khau insulating, cov neeg ua haujlwm hauv cov chaw tsim kho yuav tsum hnav khau tiv thaiv kev ua haujlwm, yog li rau cov neeg ua haujlwm hauv kev lag luam steel xav tau nkawm khau los tiv thaiv lawv txhais taw. Raws li peb txhua tus paub, kev lag luam hlau thiab hlau yog kev lag luam kev lag luam feem ntau koom nrog ferrous hlau ntxhia mining thiab ferrous hlau smelting thiab ua thiab lwm yam kev lag luam ntau lawm.Nyob rau hauv cov txheej txheem ntawm hlau thiab hlau smelting, txaus ntshai thiab teeb meem yam tseem ceeb yog concentrated, thiab thaum muaj xwm txheej tshwm sim, nws yuav ua rau muaj qhov tshwm sim loj thiab raug mob hnyav.
Hlau yog tsim los ntawm "hnyav" lossis yog hlau, txhuas, hlau, xws li kev sib cuag, yog kev sib cuag nrog cov hlau thiab lwm yam "kev phom sij", yog li muaj hlau phaj siab, hlau phaj semi-tiav khoom, hlau khoom. , xws li hnyav hnyav poob ntawm qhov chaw instep, ntiv taw los yog muaj peev xwm txaus ntshai rau ko taw ntawm kev nyab xeeb, yog li cov neeg ua haujlwm yuav tsum hnav lub luag haujlwm tiv thaiv muaj cov khau tiv thaiv kev nyab xeeb.
Nyob rau tib lub sij hawm, nyob rau hauv cov hlau los yog hlau, lub cub tawg ua ntej tus neeg teb xov tooj tej zaum yuav molten hlau los yog slag burns; Nyob rau hauv lub ingot foundry, tig los yog ntog tawm ntawm lub steel nruas yuav ua rau kub hnyiab.Nyob rau hauv lub qhov, ib tug neeg ua hauj lwm stumbles kub. hlau; Molten hlau los yog sparks spilled thaum lub sij hawm smelting txheej txheem yuav hlawv tus neeg teb xov tooj lub qhov muag, ko taw thiab lwm qhov chaw ntawm lub cev, yog li cov neeg ua hauj lwm steel kuj yuav tsum tau muaj peev xwm tiv taus qhov kub siab ntawm kev sib tsoo kev ruaj ntseg khau, tiv thaiv kev ruaj ntseg khau .
Txhawm rau tiv thaiv kev sib tsoo steel hlau thiab txo qis kev raug mob rau cov neeg ua haujlwm, cov tuam txhab yuav tsum txhim kho cov xwm txheej thiab ntxiv dag zog rau kev tiv thaiv, siv cov kev ntsuas nruj kom txhim kho kev ua haujlwm thiab ntxiv dag zog rau kev tiv thaiv cov neeg ua haujlwm. Txhawm rau txo cov kev raug mob, cov neeg ua haujlwm yuav tsum tau siv cov kev tiv thaiv tus kheej, hnav cov khoom tiv thaiv tus kheej, xws li lub kaus mom tiv thaiv, tsom iav tiv thaiv, cov hnab looj tes tiv thaiv, tiv thaiv khaub ncaws, khau tiv thaiv kev nyab xeeb, khau tiv thaiv kev nyab xeeb, khau siab kub.