中科新闻网魅族手机被锁定怎么办:选哪一个，有关铁碳合金的问题
来源：百度文库 编辑：中科新闻网 时间：2024/05/05 10:55:39
The predominant phase in the iron-carbon alloy system for a composition with 99% Fe at room
temperature is which of the following?
a.austenite
b.cementite
c.delta
d.ferrite
e.gamma
temperature is which of the following?
a.austenite
b.cementite
c.delta
d.ferrite
e.gamma
b.cementite 我记得是渗碳体 好象在哪本书上见过