Structure: Ib qho kev xyaum ua dej khov feem ntau muaj cov laum me ntsis, laum pas nrig, crank kov (los yog chav fais fab), thiab cov ntawv qhia dej khov. Qhov qis kawg ntawm lub laum pas nrig yog haum nrog ib tug kauv laum me ntsis rau txiav los ntawm cov dej khov txheej; cov ntawv qhia dej khov yog ntsia ib ncig ntawm lub laum pas nrig los pab tshem tawm cov hlais dej khov.
Hom: Cov tho dej khov tau muab faib ua ob hom: tes-cranked xyaum thiab lub zog xyaum. Tes-cranked xyaum yuav tsum tau phau ntawv kev sib hloov ntawm lub crank kov los tsav lub laum pas nrig, thiab yog haum rau thinner ice khaubncaws sab nraud povtseg los yog cov xwm txheej uas txuag lub zog tseem ceeb. Lub tshuab fais fab yog nruab nrog lub tshuab hluav taws xob lossis roj av ua lub zog siv hluav taws xob, tso cai rau cov dej khov sai dua thiab tsis tshua muaj zog, thiab tsim nyog rau cov txheej txheem dej khov hnyav dua lossis ua haujlwm ntev.
