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cov khoom

Cov khoom tsim tawm ntawm lub tshuab luam ntawv yog ib qho ntawm cov duab kos duab ntawm lub tshuab luam ntawv nrog rau cov cab kuj. Cov kev sib sau ua ke muaj xws li kev tsim chamber, ib qho kev tsim scraper, ib qho kev tsim cov hlau nplaum, tus tsim tawm, ib qho kev sib tw, thiab lwm yam. Lub chamber tsim yog qhov chaw nqa khoom thiab qhov chaw nplawm.