Cov lus qhia luv luv rau cov khau khau

Nres nkawm khau yog cov khoom sib txhuam ntawm lub nruas nres, uas yuav tsum tsis yog tsuas yog muaj lub zog thiab nruj raws li cov khoom siv, tab sis kuj muaj qhov siab tshaj plaws thiab ruaj khov kev sib txhuam coefficient ua tau, nrog rau qhov tsim nyog hnav tsis kam, kub tsis kam, kub dissipation, thiab thermal muaj peev xwm.