Rolling mills yog cov khoom siv uas paub txog cov txheej txheem hlau dov, thiab feem ntau yog hais txog cov khoom siv uas ua tiav tag nrho cov txheej txheem ntawm cov khoom siv dov.Raws li tus naj npawb ntawm cov yob, lub tshuab yob tuaj yeem muab faib ua ob yob, plaub yob, rau yob, yim yob, t ...
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