Kev Qhia:
Cov khoom no yuav siv tau ntev thiab ua haujlwm yooj yim, yog li peb tuaj yeem txuag tau them nqi thaum ua lub phab ntsa. Ib qho nws yog qhov chaw, peb siv tus qauv tshiab hexagon hlau nplaum, tuav quab yuam yog ntau tshaj 70 kg, nws tuav nruj nreem, tsis muaj khib nyiab, zoo li nrog ntau zog ua xuab zeb mus rau lub platform.
Nthuav Qhia:
Tswv Yim:
Cov khoom siv hlau nplaum no yog cov hlau nplaum (rubber) thiab cov roj hmab (rubber ductility) vim qhov zoo ntawm cov roj hmab plav yog zoo heev, yog li cov hlua khi no muaj ntau yam # 86 hauv lub npov loj, hauv qab no yog qee cov lus qhia ntawm kev siv.
1, yog tias koj lub npov nyob hauv lub thawv ntawv me me me dua lub roj hmab, koj tuaj yeem siv riam phom ntxiv raws li koj lub voj voog sab hauv.
2, yog tias koj lub npov fab hauv lub thawv ntawv loj me me loj dua cov roj hmab, koj tuaj yeem qhwv tau ib co yeeb yaj duab nyob ib ncig ntawm rubber, ces nws tuaj yeem ua haujlwm. 
Cim npe nrov: pob zeb txuas hluav taws xob, ntxig hluav taws xob, cov tuam txhab, cov khoom lag luam, lub Hoobkas
