在足够能量的光照射太阳电池表面时，在P-N结内建电场的作用下，N区的空穴向P区运动，P区的（）向N区运动。
参考答案：电子
根据汉语提示,用单词或词组的适当形式填空。
1. Town Cinema is the ______(最靠近) to my home.
2. My sister is______(更外向)than me.
3. —______(多少) sandwiches are there on the table?
—There are two.
4. Were there any ______(鲨鱼)at the aquarium?
—No, but there were some seals.
5. Mother always cleans the ______(客厅)on Saturday.
工作计量器具是指日常工作中（）所使用的计量器具。
A、现场测量
B、指定场所测量
C、固定场所测量
D、一定范围测量
