低压配电箱的电器安装板上应分设（）端子板和（）端子板。
参考答案：N线；PE线
用括号内所给动词的适当形式填空
1. Mr. Green ______(have) lunch at school.
2. Two books ______(be) in the room.
3. They ______(not play) volleyball today.
4. ______ your father ______(go) there every day?
5. Some chicken ______(be) on the plate.
6. Jack ______(not know) my telephone number.
7. Can you ______(bring) some things to school?
8. Nice ______(meet) you.
9. Let’s ______(draw) these pictures.
10. Please ______(take) this desk to the classroom.
新疆棉( )
