题目内容

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

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

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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

耐火材料刚玉料的主要成份是()。

Al2O3
B. SiO2
C. MgO