Cov tshuaj lom neeg muaj kuab lom ntawm 20crmnti txias taub hau steel kub dov hlau qws tau ua tib zoo ua tib zoo.

Hais txog cov khoom siv lub cev, nws cov khoom pov thawj zoo tshaj plaws lub zog thiab tensile dats muaj kev ntxhov siab ib puag ncig.

Raws li tus txias taub hau hlau, nws cov kev sib tsoo txias yog qhov zoo tshaj plaws.

Hauv cov txheej txheem ntau lawm, cov txheej txheem kub dov ua si lub luag haujlwm tseem ceeb.

Nrog nws cov kev ua tau zoo, cov thev naus laus zis siab, thiab dav siv, 20crmnti txias taub hau steel kub-dov hlau qws sawv ntawm qhov ua ntej ntawm cov niaj hnub yoj tes.

Hot Tags: , , Chaw tsim tshuaj paus, Hoobkas, khoom xa khoom