Hom Calender
Calender yog cov cuab yeej tseem ceeb hauv kev tsim cov calender. Tus naj npawb ntawm rollers ntawm lub calender yog tsawg kawg yog peb rollers, plaub lossis tsib rollers; peb rollers thiab plaub rollers yog feem ntau. Lub tsib- cov menyuam yaus feem ntau yog siv los tsim cov nplooj ntawv nyuaj, thiab feem ntau siv tsawg dua. Cov rollers yog teem rau hauv daim duab peb sab, L, thim rov qab L, zoo Z, oblique Z, linear, thiab lwm yam.
Cov qauv ntawm lub calender