问题 填空题

如图所示,小明将自制的高度计从教学楼一楼那到五楼,玻璃管中的水柱将______(填“上升、下降或不变”).自制高度计时要注意的问题是______.

答案

只有瓶内气体的压强大于外界大气压时,它才能压着水柱升到瓶口之上;上楼时,高度在升高,大气压会随高度的增加而减小,外界大气压变小,瓶内气压大于外界大气压,会进一步向外压水柱,所以水柱将会升高.自制的气压计或高度计是利用平内外的压强不同导致玻璃管中液柱发生变化,故在制作过程中瓶口必须密封,不能漏气.

故答案为:上升,瓶口必须密封,不能漏气.

多项选择题
阅读理解

阅读理解。

     Every year, the Wilsons go to the beach for a week vacation. There are

many interesting things to do at the beach.

     The children play games on the sand. Sometimes they build sandcastles.

There are saltwater (海水) swimming pools. The children can swim safely in

these pools and the water is always clean.

     There is an esplanade (游逛的广场). This is a long road by the beach,

They are many cafes and restaurants on the esplanade. There is also an

amusement (娱乐) park beside the beach. This is a place with many kinds of

rides.

     The Wilsons always stay at the same hotel. They usually have the same

rooms. These rooms are at the front of the hotel. There is a good views(风景) of the ocean (海洋) from their windows, The children are a little sad when

the vacation is over because they don't want to go home.

根据短文内容完成下列各小题.

1.How often do the Wilsons go to the beach for vacation every year?

________________________________________________________________________

2.Where can the children swim safely?

________________________________________________________________________

3.Can visitors drink or eat on the esplanade ?

________________________________________________________________________

4.Why do the Wilsons stay at the front of the hotel ?

________________________________________________________________________

5.How do the children feel when the vacation is over?

________________________________________________________________________