Cov txheej txheem tsim nyog ntawm cov khoom siv tau tsav tsheb yog qhov tseem ceeb rau kev tsim khoom kom tsim nyog thiab ua haujlwm nyob hauv qhov loj heev ntws thiab muaj txiaj ntsig. Muaj ntau ntau qhov zoo hauv peb cov kev sib ncag rau cov pulleys. Lawv lub neej ntev thiab lub neej pulley, txo cia lub sij hawm thiab cov nqi zog, and are more accurate and efficient than any other tool or conventional… nyeem ntxiv »
