A.6µm B.8µm C.20µm D.50µm
A.鍍銀層厚度不宜小于20µm,硬度應(yīng)大于120HV B.鍍銀層厚度不宜小于50µm,硬度應(yīng)大于100HV C.鍍銀層厚度不宜小于20µm,硬度應(yīng)大于100HV D.鍍銀層厚度不宜小于50µm,硬度應(yīng)大于120HV