-
Qhov Cub Rau Cov Khoom Siv Roj Hmab Vulcanization Thib Ob
Kev Siv Cov Khoom Siv Cov txheej txheem siab heev no yog siv los ua kom tiav qib ob ntawm cov khoom siv roj hmab, yog li ua kom lawv cov khoom siv lub cev thiab kev ua tau zoo tag nrho. Nws daim ntawv thov yog tshwj xeeb rau kev ua kom tau raws li qhov xav tau ntawm qib ob ntawm cov khoom siv roj hmab, tshwj xeeb tshaj yog hais txog qhov roughness ntawm qhov chaw, kom ntseeg tau tias qhov du thiab tsis muaj qhov tsis zoo ntawm cov khoom kawg. Cov yam ntxwv ntawm cov khoom siv 1. Sab hauv thiab sab nraud ntawm th...
