Tam sim no, muaj ntau yam ntawm lub rooj zaum log ntawm kev ua lag luam, uas tuaj yeem muab faib ua aluminium alloy, cov khoom siv lub teeb thiab steel raws li cov khoom siv, xws li cov rooj zaum muaj log thiab cov rooj zaum tshwj xeeb raws li hom. Cov rooj zaum tshwj xeeb tuaj yeem muab faib rau hauv ...
Nyeem ntxiv