Kraft daim ntawv yog siv los ua cov khoom ntim, tsis tsuas yog muaj lub zog loj, muaj zog tsim kua muag, sib zog ua haujlwm thiab ua haujlwm muaj zog, tab sis kuj muaj ntau hom. Cov khoos kas hauv qab no yuav qhia koj ib ntawm nws cov ntawv luam tawm xim kraft.
Lub teeb xim kraft ntawv yog hu ua lub teeb xim kraft ntawv vim nws qhov xim xim. Txawm hais tias nws tsis yog kraft ntawv cov khoom lag luam, nws yog ib qeb ntawm kraft ntawv, ib qeb me ntawm kraft ntawv faib tawm. Nyob rau hauv ib txwm muaj xwm txheej: nws tuaj yeem siv los ua cov siv tau siv tes ua lub hnab tes, lub hnab ntim tes, lub thawv ntim, hnab ntim khoom, thawv ntawv thiab lwm yam khoom lag luam; nws kuj tseem siv tau ua lub thawv xov tooj ntawm tes, phau ntawv tuav, tiv thaiv npog ntim lub thawv thiab lwm yam khoom.