诛仙3天帝宝库副本在哪:Which one of the following materials has the highest hardness?
来源:百度文库 编辑:高校问答 时间:2024/04/26 14:35:31
a.alumina ceramic
b.gray cast iron
c.hardened tool steel
d.high carbon steel
e.polystyrene
b.gray cast iron
c.hardened tool steel
d.high carbon steel
e.polystyrene
哪个以下材料有最高的坚硬?
a 。铝土陶瓷
b 。灰色生铁
c 。被硬化的工具钢
d 。高碳钢
e 。多苯乙烯
D
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