hlau luam ntawv tsis meej, tsis tuaj yeem lees paub, tsis tsim nyog
Cov xim ntawm lub hau sab nrauv ntawm tib lub xaim yog qhov sib txawv, thiab xim txawv yog> 1, tsis tsim nyog
Cov hlau yog deformed heev thiab tsis tsim nyog
Qhov saum npoo ntawm cov hlau muaj pob> 0.5mm, uas yog xim dawb thiab tsis tsim nyog
Qhov saum npoo ntawm cov hlau yog qias neeg thiab tsis tuaj yeem raug tshem tawm, tsis tsim nyog
Cov tub ntxhais hlau ntawm cov hlau yog raug tooj liab, tsis tsim nyog
Hlau nto khawb qhov khawb qhov ntev> 5mm, qhov tob> 0.15mm, tsis tsim nyog
Cov hlau yog scorched thiab tsis tsim nyog
Kev tshuaj xyuas ntawm lub davhlau ya nyob twg
Tsim nyog
Kev tshuaj xyuas ntawm lub davhlau ya nyob twg
Tsis tsim nyog
