从状态图看含碳0.4%、0.9%的碳钢在室温下由哪些组织构成?
参考答案:
0.4%由铁素体F.+珠光体(P)0.9%由二次渗碳体(Fe3CⅡ)+珠光体(P)
— What _____ you do the day before yesterday?
— I helped _____ with her English. [ ]
A. did; see
B. do; her
C. did; her
早期胃癌揩
A.局限于胃窦部
B.局限于黏膜或黏膜下层
C.直径在2cm以内
D.尚无淋巴转移
E.尚未侵及浆膜层