Cov qauv tsim los ntawm pwm pwm, nrum pwm thiab kub pwm yog qhov yooj yim heev.Qhov qauv ntawm cov pwm siab, txhaj pwm thiab kis pwm yog qhov nyuaj dua, thiab muaj ntau ntu ntawm cov pwm no.
1) tsim thooj, suav nrog concave tuag, punch, txhua hom kev tsim tub ntxhais, nws yog daim uas ua rau sab hauv, sab nraud sab saum lossis sab saum toj, hauv qab kawg ntsej muag, sab qhov, sab concave thiab xov.
2) Txhawb qhov chaw ruaj khov, suav nrog pwm rooj zaum phaj, phaj kub, txhawb phaj, ncoo thiab lwm yam, txhawm rau txhim kho lub pwm lossis kev txhawb nqa siab.
3) Daim ntawv qhia ua haujlwm, suav nrog tus ncej coj thiab phau ntawv qhia lub tes tsho, txhawm rau txiav txim siab qhov chaw sib piv ntawm cov pwm lossis laub txav.
(4) cov tub ntxhais rub ntu, suav nrog oblique tus pin, lub vias swb, thiab lwm yam, hauv cov pwm qhib kom rho tawm qhov tseem ceeb, yog li ntawd tawg. (5) thawb daim, suav nrog cov laub pas, laub raj, thawb thaiv, thawb phaj, thawb ntu ntiv nplhaib, thawb pas nrig tsau phaj, laub phaj, thiab lwm yam
