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This paper focuses on the mechanism of the material transfer with symmetrically-pairing and asymmetrically-pairing contacts made of silver-base materials at make and at break of electric contacts. 本文主要研究銀基觸頭材料對稱配對和非對稱配對時直流小電流下觸頭在分斷和接通過程中的材料轉(zhuǎn)移機理。