将钢料置于炉温基本不变的炉内进行加热的过程为（）式的加热制度。
A.一段式
B.二段式
C.三段式
D.多段式
参考答案：D
人口最多的省区是________，人口最少的省区是________。
---Don't you enjoy watching the English programme Outlook English Magazine
on CCTV Channel 10?
---________. I think it very helpful to improve my listening and speaking abilities.
A．Yes, I do
B．No, I don't
C．Yes, I don't
D．No, I do
