初轧坯的主要优缺点是什么?
参考答案:
优点:初轧坯断面尺寸、形状较灵活,钢坯内部质量好,钢种面宽。
缺点:金属消耗较大(收得率较低),能耗较高,外形尺寸不够精确。
用括号中所给单词的适当形式填空。
1. Let go first. (they)
2. I like a bus to school. (take)
3. A plane is than a train. (fast)
4. Our school has two students. (thousand)
5. a lot for your help. (thank)
自我暗示法可以用来治疗失眠。