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Lub neej yav tom ntej ntawm Kev xa hluav taws xob: Vim li cas Pulleys thiab Sprockets tseem yog qhov tseem ceeb hauv lub ntiaj teb hluav taws xob
Raws li kev lag luam thoob ntiaj teb hloov mus rau kev siv hluav taws xob thiab kev siv hluav taws xob, cov lus nug tshwm sim txog qhov cuam tshuam ntawm cov khoom siv hluav taws xob ib txwm muaj xws li pulleys thiab sprockets. Thaum hluav taws xob ncaj-tsav tshuab tau txais kev nyiam ...Nyeem ntxiv
