1972年室兰厂出现直空槽吹氧技术,该技术称为RH-OB,其效果为()。
A.减少冶炼时间
B.解决真空槽结冷钢问题
C.增加环流速度
D.快速脱碳
参考答案:D
根据所给的首字母或中文提示,写出单词,每空只填一词。
1. In China, students go to school from Monday to F__________.
2. The boys like reading. They often b__________ books from the school library.
3. It was so dark that we couldn't see the road c___________.
4. My shoes are too old, I want to buy a new p__________.
5. The radio says it will be__________ (晴天) tomorrow.
6. Please don't __________ (担心) about Jim.he can take care of himself.
7. My uncle was born in __________ (六月), 1968.
8. His __________ (梦想) is to be a doctor.
9. Hurry up,or we will __________ (错过) the school bus.
10. An unhappy home __________ (环境) can affect a child's behavior.
金属材料对于压痕、抓痕、磨蚀或切削的抗力或阻力叫硬度。