Thawj 10 mus rau 15 vib nas this tom qab kis tau cov khoom phom sij, tshwj xeeb tshaj yog cov khoom corrosive, yog qhov tseem ceeb.Kev ncua kev kho mob, txawm tias ob peb feeb, tuaj yeem ua rau raug mob hnyav.
Cov da dej kub ceev thiab qhov chaw ntxuav qhov muag muab cov tshuaj tua kab mob ntawm qhov chaw.Lawv tso cai rau cov neeg ua haujlwm tshem tawm cov khoom phom sij uas tuaj yeem ua rau raug mob.
Kev raug tshuaj lom neeg raug xwm txheej tseem tuaj yeem tshwm sim txawm tias muaj kev tswj xyuas zoo engineering thiab kev tiv thaiv kev nyab xeeb.Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tsum tau saib dhau ntawm kev siv cov tsom iav, daim npog ntsej muag, thiab cov txheej txheem siv cov cuab yeej tiv thaiv tus kheej.Cov da dej kub ceev thiab qhov chaw ntxuav qhov muag yog qhov tsim nyog thaub qab kom txo qis qhov cuam tshuam ntawm kev sib tsoo ntawm cov tshuaj.
Cov da dej kub ceev kuj tseem siv tau zoo hauv kev tua hluav taws kub hnyiab khaub ncaws los yog txhawm rau ntxuav cov kab mob ntawm cov khaub ncaws.
Post lub sij hawm: Mar-19-2019
