复合钢是两种材料密合在一起。()
参考答案:错
---I did really well in the examination, Li Ke.
---I did _________. I got full mark.
A.no less
B.not less
C.not worse
D.no worse
高炉炼铁是一个()气氛的过程。
A.氧化
B.还原
C.先还原再氧化
D.先氧化再还原