用 there be 或 have的适当形式 填空。

1. This desk _________ four legs.

2. __________ some books on the desk.

3. Everyone ___________ a dictionary in my class.

4. ___________ (没有) knives in the room.

5. I ___________ a new sweater.

6. ___________ some flowers and a desk in the room.

7. ___________ nothing in the bag.

8. They ____________ something to eat.

（）是指自引水装置开始工作至消防泵的出口压力表开始显示压力的时间。

A.手抬机动消防泵组

B.引水时间

C.吸深

D.高低压联用工况