有一个机器零件长5毫米，画在设计图纸上长2厘米，这副图的比例尺是______．
2厘米=20毫米，
则20：5=4：1．
答：这副图的比例尺是4：1．
Ⅰ Ⅱ
小题1:Don’t run in the hallway. A. They’re delicious, thanks.
小题2: How about the apples? B. It was cloudy.
小题3:What did Sam do last Sunday? C. I’m sorry, Ms Cao.
小题4: What does he think of the game show? D. He played tennis with his friends.
小题5:What was the weather like yesterday? E. He doesn’t mind it.
转炉的温度控制是指（）。
A.吹炼终点温度控制
B.吹炼过程温度控制
C.吹炼过程温度和吹炼终点温度控制
