Tsis muaj ib qho qauv, sib koom ua ke rau cov kev qhia tshwj xeeb ntawm qhov kub thiab txias - tswj cov khoom ntim khoom txias. Nws feem ntau yog tsim los ntawm hom, qhov hnyav, ntim, qhov xav tau ntawm qhov kub thiab txias, thiab lub sijhawm thauj khoom ntawm cov khoom thauj. Kev ntsuas kub ib txwm- tswj cov ntim khoom feem ntau muaj lub thawv sab nraud, txheej txheej rwb thaiv tsev, sab hauv ob sab phlu, tub yees, lossis lwm qhov kub thiab txias-tswj xov xwm. Cov lus qhia tshwj xeeb feem ntau qhia los ntawm qhov ntev ntawm sab nraud, lub ntim ntim zoo, thiab thauj khoom- muaj peev xwm. Qhov ntsuas kub me me- tswj cov ntim khoom uas muaj nyob hauv khw yog tsim rau cov khoom noj tshiab, tshuaj, thiab cov qauv kuaj uas hnyav ob peb kilograms lossis tsawg dua. Qhov nruab nrab- ntim ntim feem ntau yog siv rau cov khoom uas hnyav ib ncig ntawm kaum kilograms, thaum qhov kub thiab txias -cov thawv tswj tau raws li qhov xav tau ntawm kev thauj khoom ntau dua. Nyob rau hauv cov nqe lus ntawm kev tsim loj, nws yog ib qho tsim nyog los xyuas kom meej qhov tsim nyog txoj kev sib raug zoo ntawm cov khoom thiab cov tub yees tom qab loading. Qhov chaw ntau dhau yuav tsum tsis txhob ua rau qhov tsis sib xws ntawm qhov txias txias, thiab yuav tsum overly compact ntim compromise kub stability. Ib txhij, lub thickness ntawm cov rwb thaiv tsev txheej yuav raug kho raws li lub sij hawm thauj mus los thiab ambient kub. Lub sijhawm thauj mus los ntev dua thiab ntau dua qhov kev hloov pauv ntawm qhov kub thiab txias, qhov siab dua qhov yuav tsum tau ua rau kev ua haujlwm rwb thaiv tsev feem ntau yuav tsum tau ua.
Ntxiv nrog rau qhov ntev ntawm sab nraud, qhov tshwj xeeb ntawm qhov kub thiab txias - tswj cov khoom siv txias txias kuj tseem suav nrog cov khoom siv xws li qhov kub thiab txias, lub sijhawm tswj qhov kub thiab txias. Piv txwv li, cov khoom sib txawv yuav xav tau kev thauj mus los hauv cov tub yees, khov, lossis ib puag ncig tswj qhov kub thiab txias, yuav tsum tau xaiv cov kev ntsuas kub kom tsim nyog. Qee lub ntim tuaj yeem tsim nrog kev tswj qhov kub thiab txias ntawm 24 teev, 48 teev, 72 teev, lossis ntev dua, nyob ntawm qhov xav tau kev thauj mus los tiag tiag. Qhov ntau, qhov hnyav, thiab qhov chaw ntawm lub tub yees kuj yuav tsum tau ua tib zoo xam; tsuas yog nce tus nqi ntawm cov tub yees tsis tuaj yeem txhim kho cov nyhuv rwb thaiv tsev, vim qhov no tuaj yeem ua rau thaj tsam qis qis lossis txawm tias khov puas tsuaj rau cov khoom. Rau qhov kub thiab txias - cov khoom lag luam rhiab heev xws li cov tshuaj thiab cov khoom siv roj ntsha, cov ntsuas kub thiab ntsuas kub yuav tsum tau teeb tsa raws li cov cai tshwj xeeb. Zuag qhia tag nrho, kev tsim cov khaub ncaws txias txias- tswj ntim tsis yog hais txog kev nrhiav cov ntim loj, tab sis yuav tsum muaj kev xav txog ntau yam xws li cov khoom hnyav, lub peev xwm sab hauv, qhov kub thiab txias, lub sij hawm rwb thaiv tsev, ib puag ncig kev thauj mus los, thiab cov khoom ntim kom ua tiav cov qauv ntim tsim nyog thiab kev tswj qhov kub thiab txias thaum ua tau raws li qhov yuav tsum tau muaj kev nyab xeeb kev thauj mus los.