题干

小明假期要外出一段时间,她担心家里盆景中的水会因蒸发而干掉,于是用了一个塑料瓶装满水倒放在盆景中,瓶口刚刚被水浸没,如图所示,这样就能使盆景中的水位保持一定的高度.下列说法正确的是(   )

A:瓶内水上方的气压等于外界大气压

B:瓶内水上方的气压大于外界大气压

C:随着盆景中的水不断蒸发,瓶内的水产生的压强会不断减小

D:瓶口处的压强总是大于外界大气压

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答案(点此获取答案解析)

C

同类题5

阅读下列短文,根据短文内容,从短文后各题所给的A、B、C、 D四个选项中,选择最佳选项。

SCENE I

One dollar a week

The doorway of the house where Chandler has a room. He is dressed in his best clothes, ready for his evening out. He is going out as his friend, Jeff White, comes in.

WHITE         What are you doing this evening, Towers?

CHANDLER      (Smiling) Tonight I'm going to live like a man with a million dollars!

WHITE         What are you talking about? You haven't got a million dollars!

CHANDLER      How much money are you and I paid each week, Jeff?

WHITE         Eighteen dollars. Why?

CHANDLER      And how much of that eighteen dollars do you spend each week?

WHITE         All of it, of course.

CHANDLER    Well, I don't. Each week I save one dollar out of my eighteen. Then, every ten weeks, I can buy myself an evening to remember.

WHITE         What do you do?

CHANDLER   I put on my finest clothes, go to one of the best restaurants in New York, eat the most expensive food on the menu, drink the best wine, and then take a taxi home!

WHITE          (Surprising) Why?

CHANDLER     Why? Because it makes me feel wonderful to sit with some of the richest people in America, and to make them think that I'm rich, too.

WHITE          You're crazy!

CHANDLER     (Laughing) Perhaps I am!

Mrs Black comes in.

MRS BLACK      Ah, Mr Chandler. I wanted to see you.

CHANDLER      Good evening, Mrs Black. What a lovely evening!

MRS BLACK   Lovely evening perhaps, but you haven't paid me for your room this month. When am I going to get the money?

CHANDLER     Soon, Mrs. Black. Very soon.

Mrs Black looks at Chandler's clothes.

MRS BLACK      You can spend money on expensive clothes, but you can't pay for your room. Is that right?

CHANDLER    (Hurrying away) Good night, Mrs Black!