Sep 19, 2022
Tso lus
500pcs tooj liab raws li kev sib txhuam disc tiav thiab npaj rau kev xa khoom
Cov yam ntxwv cuam tshuam rau kev sib txhuam coefficient ntawm Friction Phaj
Dab tsi yog hom hnav ntawm cov khoom sib txhuam?