Cov ntsia hlau ntsia hlau, tseem hu ua cov ntsia hlau hlau, yog hom tshwj xeeb ntawm cov ntsia hlau ua los ntawm cov hlau. Cov ntsia hlau no muaj kev ntxhib los mos vim cov khoom siv, uas yog 45 # steel lossis 60 # steel. Lawv tau dhau los ua cov txheej txheem ntawm kev kos duab, annealing, nailing, thiab quenching, uas ua rau lub st ...
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