#1- Tsis muaj kev saib xyuas
Lub caj npab tswj yog ib qho ntawm cov khoom tseem ceeb ntawm lub tsheb ncua kev kawm ntawv. Thaum peb tswj lub tsheb tsis tu ncua, tsis txhob hnov qab xyuas thiab tswj xyuas qhov mob ntawm caj npab, vim nws yog ib qho khoom siv. Yog tias kev tshuaj xyuas thiab kev saib xyuas tsis tu ncua, dhau sijhawm, lub pob sib koom ua ke yuav maj mam xoob lossis lub tes tsho hlau yuav raug puas tsuaj, uas tej zaum yuav yog ib qho laj thawj rau kev tswj caj npab kom tawg.
#2- Cov teeb meem zoo
Yog tias siv cov caj npab tsis zoo lossis tsis zoo yog hmoov tsis zoo, nws yuav ua rau muaj kev pheej hmoo ntawm kev tswj caj npab ua rau tawg lossis deformation thaum siv. Cov xwm txheej no tuaj yeem tshwm sim los ntawm qee qhov tsis xws luag hauv cov txheej txheem tsim khoom, xws li kev teeb tsa tsis raug ntawm lub tes tsho hlau lossis pob taub hau, lossis siv cov khoom siv tsis zoo.
#3- Txoj kev
Thaum tsav tsheb ntawm txoj kev, yog tias txoj kev mob hnyav heev, xws li pob, cov pas dej loj, lossis kev cuam tshuam, nws yuav ua rau lub nra hnyav rau ntawm caj npab tswj. Kev tsav tsheb txuas ntxiv ntawm txoj kev no tuaj yeem ua kom nrawm thiab ua rau lub caj npab tswj kom khoov, deform, lossis tawg.
#4- Kev siv ntau dhau
Thaum tsav tsheb ntau dhau los yog tsis tsim nyog tshaj qhov siab thiab thauj khoom txwv ntawm kev tswj caj npab tsim, nws yuav ua rau tswj caj npab qaug zog lossis puas tsuaj. Cov xwm txheej no feem ntau tshwm sim thaum lub sijhawm tsav tsheb ntev, kev tsav tsheb hnyav thiab hnyav, xws li nres nres, nrawm nrawm, lossis thauj ntau dhau.
#5- Tsheb sib tsoo
Thaum lub tsheb muaj kev cuam tshuam muaj zog lossis kev sib tsoo loj, lub caj npab tswj ntawm lub kaw lus ncua kev sib tsoo thiab puas vim yog sab nraud quab yuam ntaus thiab sib tw. Yog tias muaj kev huam yuaj tshwm sim, txawm tias nws tsuas yog kev sib tsoo me me, nws raug nquahu kom kuaj xyuas qhov xwm txheej ntawm caj npab tswj thiab seb nws puas yuav tsum tau hloov kho kom muaj kev nyab xeeb ntawm kev tsav tsheb.
