根据括号内的汉语提示，完成句子。

1.I shall not be _____ (有空的) until five o'clock.

2.Switzerland is _____ (出名的) for its mountains.

3.Two _____ (百) students in our school are going to the beach .

4.We should brush our _____ (牙齿) at least twice a day.

5.There will be three football _____ (比赛) this month in our school.

6.We're _____ (计划) a vacation to Italy this summer.

凝泵入口滤网压差应小于多少？