Core Feem ntau ntawm cov khoom siv hlau nplaum yog cov neeg ua haujlwm tsis zoo ntawm cov dej ntws thiab muaj cov permeability tsawg, thaum cov ntaub ntawv uas tsis yog-conductive xws li huab cua, tooj liab, thiab ntawv muaj tib qhov kev txiav txim siab ntawm qhov permeability. Qee cov ntaub ntawv, xws li hlau, npib tsib xee, cobalt thiab lawv cov alloys, muaj permeability siab. Hauv ...
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