Thaum lub sij hawm siv band band pom tuaj, yuav muaj ntau yam teeb meem. Ntawm lawv, pob txha tawg lossis keej ntawm cov saw saw yog cov teeb meem feem ntau. Feem ntau, cov pob txha lov uas tshwm sim yog mus tib seem rau ntawm lub weld, thiab ntev ntawm qhov kev puas ntawm cov saw uas tau pom koj puas tau ntsib? Cov saw uas pom muaj qhov sib sib zog nqus thiab sib sib zog nqus raws li kev taw qhia ntev. Hauv cov xwm txheej loj, cov saw saw tau faib ua ob rau peb txoj hlua me me. Nws tsis tshua muaj qhov txham tau tawg yooj yim li riam txiav. Tab sis dab tsi yog qhov zoo dua ntawm qhov tshwm sim no?
1. Cov ntawv qhia coj los thaiv lossis qhia sab caj npab ntawm cov khoom muaj cov tawv tawv ntawm cov kab sib xws.
2. Ib qho khoom siv nyuaj yog muab zaws mus rau qhov sib txuam ntawm cov sib dhos sib dhos lub rim thiab khawb ntawm cov saw kaw, thiab saum npoo ntawm cov xov saw sab nraud tas li cuam tshuam los ntawm qhov nyuaj.
3. Qhov kev ncua deb ntawm pom lub log thiab phau ntawv qhia caj npab yog me me, thiab qhov nce ntawm kev sib zog ua rau cov saw saw ntuag hauv qab qhov kev ua ntawm sib sib zog tas li.
