题目内容

简述电化学腐蚀的原理。

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In a gold-based alloy，copper does which of the following()

A. prevents corrosion
B. increases malleability
C. increases hardness
D. A and B

陶瓷材料结构上的玻璃相有何作用？

In a gold-based alloy，palladium does which of the following()

A. increases tarnish
B. increases melting temperature
C. produces darkening
D. reduces hardness

下面哪个元素具有较大的细胞毒性()

Au
B. Pd
C. Ni
D. Pt