Kev tsim khoom lag luam xav tau cov dej huv ua cov khoom siv tseem ceeb lossis cov khoom siv raw, thiab kev siv cov dej tseem ceeb suav nrog dej tsis ncaj thiab dej ncaj qha ob pawg sib txawv. Cov dej ncaj qha hais txog kev tsim cov khoom kawg thiab cov dej yuav tsum tau nyob rau hauv kev sib cuag ncaj qha, yog li nws yuav cuam tshuam ncaj qha rau cov khoom zoo, cov dej yuav tsum tau muaj siab. Cov dej tsis ncaj yog hais txog cov txheej txheem tsim khoom, kev siv dej yuav tsis sib cuag ncaj qha nrog cov khoom, feem ntau ua lub luag haujlwm hauv kev pab tsim khoom, nws lub luag haujlwm tseem ceeb yog tiv thaiv cov khoom siv dej hauv cov nplai thiab xeb thiab lwm yam teeb meem, tsuas lim tawm tej yam dej los yog tej yam khoom yuav ua tau.
Txawm hais tias nws yog kev siv dej ncaj qha lossis tsis ncaj, qhov yuav tsum tau ua rau dej zoo yog qhov siab. Yog li ntawd, txhawm rau ua kom tau raws li qhov yuav tsum tau muaj ntawm cov dej tsim khoom lag luam, feem ntau cov tuam txhab lag luam yuav xaiv cov khoom siv kho dej los daws qhov teeb meem no. Vim tias cov khoom siv kho dej tuaj yeem muab faib ua cov lim dej lim dej, quartz xuab zeb lim, hlau thiab manganese lim, thiab lwm yam, raws li cov khoom siv lim sib txawv.
Yog li ntawd, peb tuaj yeem xaiv cov cuab yeej kho dej tsim nyog raws li lawv qhov xwm txheej tiag tiag los daws qee qhov teeb meem tshwm sim los ntawm cov teeb meem dej tsis zoo hauv kev tsim khoom.
