Wafer晶元
参考答案：
是生产集成电路所用的载体，多指从拉伸长出的高纯度硅元素晶柱上切下的圆形薄片。
The rules of our school don’t allow ______ at school. That is to say, Nobody is allowed _____ here.
A．to smoke; to
B．smoking; smoking
C．to smoke; smoking
D．smoking; to smoke
抗氧剂
