Yuav ua li cas xaiv hlau ua npuas ncauj khoom?
Cov khoom siv hlau ua npuas dej muaj tsib yam tseem ceeb: 1. Hlau substrate, uas yog, cov khoom siv hlau yog cov khoom siv hlau ntxeem tau ua los ntawm, suav nrog foamed npib tsib xee, tooj liab, hlau, hlau-nickel alloy, tooj liab-nickel alloy, thiab nto hea ...
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