The doctor preferred to resign rather than be accused publicly of infamous conduct.

A．unknown

B．extraordinary

C．mysterious

D．disgraceful

耐蚀(酸)非金属材料，除具备良好的耐蚀性能外，还具有的性能为( )。

A．耐急冷、急热性能
B．较好的耐冲击性能
C．良好的耐磨性能
D．优良的热处理性能