Dab tsi ua rau hnav ntawm O nplhaib

Jul 21, 2023

Fais fab hom:

 

hnav / abrasion

 

Ua tsis tiav:

 

ib. rough mating nto heev

 

b. swb txav vim lub siab pulsation

 

c. tsis ncaj ncees lawm tsim ntawm foob vaj tse (groove)

 

Kev ntsuas kho:

 

a. kev txhim kho ntawm mating nto (polishing)

 

b.yog tias tsim nyog, hloov lub foob profile

 

c.adjust seal vaj tse (groove)