Kunyangwe kushandiswa kweguruva adsorption kwakasimba kwazvo, asiwo kune yakanaka guruva scraping effect
Pfeka kuramba, hupenyu hurefu
Iine basa rekuchengetedza uye reversely kuendesa mafuta akasara
Kushandiswa kwemidziyo elastic kunogona kuderedza kukwesha
Zvikamu zvakajairwa zvinoenderana nemagrooves akajairwa