Ropes tseem muaj ntau heev hauv lub neej, tab sis ntau tus neeg tsis paub meej txog qee qhov kev siv me me ntawm cov hlua.Qhov tseeb, muaj ntau hom hlua, nyob ntawm kev siv: 1. Static rope, tseem hu ua hlua dawb, yog siv rau rappelling qhov tsua tshawb nrhiav.Txawm hais tias elasticity yog ultra-low, nws ...
Nyeem ntxiv