控制表面纵裂纹的工艺措施有()。
A.水口对中
B.结晶器液面波动<3mm
C.合适的浸入式水口插入深度
D.热顶结晶器
参考答案:A, B, C
—Would you mind if I turned on the radio and listened to some music?
—______. In fact, I also like to listen to music in my car.
A.No, you can’t
B.Yes, I do
C.No, go ahead
D.OK, no problem
铝有较强的抗腐蚀性能,主要是因为[ ]
A.与氧气在常温下不反应
B.铝性质不活泼
C.铝表面形成了一层致密的氧化膜
D.铝耐酸耐碱