Dab tsi yog qhov txheej txheem ntawm kev siv tshuaj yeeb dej cawv?
Cov txheej txheem kev siv tshuaj yeeb dej caw yog raws li nram no.
Khoom siv, khoom yas yas, kev txhaj tshuaj, qhib pwm, mold dawb paug thiab tub ntxhais qhev rotating tshuab pwm ze
Ntim thov ntim nplaim nplaum kho thov thov qhib lub raj mis los hle cov tshuab ua kom paug poob ntsej muag, thov kom lub ntsej muag tshuab txias