Sim xaiv tus number case thiab number case los sau, kom cov nyhuv filling yuav zoo dua; Vim tias tus number case ntawm lub lag luam muaj tus number case thiab number case, tus number case yog oily, thiab tus number case yog dej zoo.
Feem ntau, tus number case siv nyob rau hauv thawj number case cartridge yog number case, thaum tus number case pheej yig nyob rau hauv lub lag luam feem ntau yog dej zoo number case, uas tsuas yog hais txog 10 mus rau 20 yuan, thaum tus number case hloov yog li ntawm 50 yuan; Kev luam ntawv sau ntawv tom qab sau tus number case yog qhov tseeb heev;
