Cov tshuaj ntxiv rau txheej

Cov khoom ntxiv yog ib qho ntawm cov khoom siv raw rau cov txheej. Ib qho me me ntawm kev ntxiv tuaj yeem txhim kho qhov ua tau zoo thiab kev ua tau zoo ntawm cov txheej, thiab tseem tuaj yeem txhim kho kev ua tau zoo ntawm cov zaj duab xis txheej, thiab pab txhawb rau kev kho kom haum rau cov khoom.