转炉钢水氧含量与其它炼钢方法一样，主要受钢中（）控制。
参考答案：碳含量
—I can’t get on well with some of my classmates. They just leave me in the cold.
—________ But what’s the reason?
A．Sorry to hear that.
B．How about that?
C．Don’t mention it.
D．Never give up!
献血后的生理恢复与以下哪种情况无关（）
A.献血者的体重
B.营养状况
C.性别
D.献血量
E.身高
