什么叫冲孔?
参考答案:
冲孔是分离工序的一种,沿封闭曲线冲掉部分材料,制取所需孔的加工方法。
M: What would you like for dessert I think I’ll have apple pie and ice cream. W: The chocolate cake looks great, but I have to watch my weight. You go ahead and get yours. Question: What would the woman most probably do().
A. She’ll have some chocolate cake.
B. She’ll take a look at the menu.
C. She’ll go without dessert.
D. She’ll prepare the dinner.
地震发生后,被困废墟下是应()等待救援
A.不断大声呼喊
B.冷静的平复情绪
C.用石块或铁器敲击身旁物体
D.拼命试图挪动身体