Cov xim ntawm daim hlau sab sauv thiab qis ntawm lub tshuab nqus tsev yog tsis raug, thiab cov xim ntawm ob qhov kawg ntawm lub phaj sib txawv.Tsis tas li ntawd, xim blackening yog dab tsi?Tus kws tshaj lij los ntawm Rich Special Materials Co., Ltd, Mr Mu Jiangang, piav qhia vim li cas.Blackening yog tshwm sim los ntawm residual cua ...
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