Hlau Phaj rau Rubber Xovxwm

Cov hmoov yog muab tso rau ntawm txoj hlua steel qis kom khiav hauv lub tshuab.Cov txheej txheem nias yog los ntawm kev sib koom ua ke ntawm ob txoj hlua steel thiab ob txoj hlua khi, thiab cov hmoov yog maj mam "nruam" nias thiab tsim raws li qhov xav tau siab.