单项选择题

在下列各相中，溶碳能力最弱的固溶体是（）。
A 渗碳体
B 奥氏体
C 铁素体

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珠光体是铁碳合金在727℃发生共晶转变的产物

答案：错误

单项选择题

The speaker believes that ____________.
A、further education is not as important as before
B、 every student should go to university
C、if a student doesn’t go to college, he or she will lose more
D、 it is more difficult to go to college nowadays