9 teeb meem tshwm sim hauv kev kub ntxhov kub:
1. Cov stamping tsis ruaj khov
2.Cov ntaub ntawv kub kub yog tsaus muag thiab tsaus muag
3. khaus, muab tshuaj txhuam
4.Cov ntsiab lus ntawm daim duab yog tsis sib luag thiab tsis meej
5.Cov duab cim tsis tag thiab tsis muaj cwj nrag
6. khij nyiab lossis duab nrig
7. Ntaus stamping tsis muaj luster
8. Kev kub kub zoo tsis zoo yog tsis ruaj khov
9.Leakage tom qab kub stamping
