Roj hmab cov pob qij txha, raws li cov neeg kho tshuab txuas, yog dav siv nyob rau hauv kev lag luam xws li chemical engineering, roj av, shipbuilding, thiab lwm yam. Thaum siv nws, peb thawj zaug yuav tsum txiav txim siab nws qhov zoo los xyuas kom meej nws cov kev ua haujlwm zoo thiab kev nyab xeeb.Feem ntau kuaj nyob rau hauv cov nqe lus ntawm tsos, hardness, corrosion kuj, strect ...
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