Nta:

Lint dawb huv cov ntaub so muaj cov plua plav tshem tawm zoo heev, thiab qee qhov ntawm lawv muaj kev tiv thaiv zoo li qub, uas tuaj yeem siv rau hauv kev ua haujlwm zoo li qub.Lwm qhov pom tseeb yog nws cov dej nqus dej siab, uas tuaj yeem siv rau kev so qhuav lossis ntub dej so nrog hnyav, thiab tsis muaj lint lossis seem tom qab so.Nws yog mos thiab yuav tsis khawb qhov saum npoo ntawm cov khoom lossis ua rau cov khoom thiab cov khoom puas.Tsis muaj ion tso tawm kom tsis txhob muaj kuab paug thib ob rau cov khoom.Tsis tas li ntawd, cov ntaub huv huv yuav tsis yooj yim cuam tshuam nrog cov tshuaj reagents, yog li ua rau poob rau cov khoom.

Khoom qhia: