超声仪的分辨率可定义为()①可在显示仪上区别开来的两点间目标最小的空间间隔②在显示仪

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问题:

超声仪的分辨率可定义为()①可在显示仪上区别开来的两点间目标最小的空间间隔②在显示仪上趋于被单独一个点的目标所占据的区域或距离③在显示仪上区别出的两种独立的活动状态的最短时间间隔()。

A.①

B.①②

C.①②③

D.②③

E.①③

考点:北京住院医师医学影像Ⅰ阶段超声医学超声医学题库
题型:单项选择题

You probably know you should say” please” and “thank you ” at restaurants. You probably know the rules of a library. You know you should respect and be nice to your classmates. But do you have music manners?

Keep It Down! You have to notice the volume of your music. You should not play your music so loud that everyone around you can hear it. Some people might even get angry. Usually, when you play the music loud on an MP3 player, other people can’t hear the words of the song. They just hear a loud sound. Not one wants to listen to this. Very loud music can also be bad for your cars, so even if you are alone when listening to our MP3 player, you shouldn’t have it turned up too high.

Take Them off! You need to know when to turn your MP3 player off and put it away. Libraries and schools don’t allow MP3 players. There are other places, like museums, that don’t have rules,

but is would be rude to have your MP3 player on. Sometimes, it just doesn’t make sense to listen your MP3 player at event. Why would you listen to music at a play, a movie or a sporting event?  your would miss what is going on and others would wonder why you even came.

Take One Out! Once is a while it’s okay just to take out one earphone and not other. Imagine you are listening your MP3 player when someone asks you the way. It would not be rude to take out one earphone, tell him the way, and put back the earphone and continue listening. You can also do this when you order food at a fast-food restaurant or when you answer the telephone and it’s not for you.

It’s Your Choice! There are times when you need to decide what is best. For example, some people can listen to music on their MP3 Players when read books, while others think it is disturbing. In cases like this, you need to do what seems right for you.

小题1:The underlined word volume in Paragraph Two probably means” _____.

A.the type of music

B.the amount of a sound

C.the length of a song

D.the colour of and MP3 player小题2:No one wants to listen to _____ from others’ MP3 player.

A.a loud sound

B.sad stories

C.a long movie

D.the words of a song小题3:We should turn down the music when we are alone because loud music _____.

A.is not enjoyable

B.makes us tired

C.is bad for MP3 players

D.huts our ears小题4:If we listen to our MP3 player at a play, _____.

A.the theater won’t allow it

B.the actors will get angry

C.others won’t hear the play well

D.we will miss part of the play小题5: We can take once earphone out when we _____.

A.show others the way

B.talk to fiends on the phone

C.watch a sporting event

D.have dinner with our parents小题6:It’s all right to use our MPS player in _____.

A.schools

B.libraries

C.restaurants

D.museums小题7: What can be the best title of this passage?

A.Music Lovers

B.Music Manners

C.MP3 Players

D.MP3 Earphones

题型:单项选择题
a-2
+|b-3|=0,则a+b-5=______.
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统计分组的关键是正确选择分组对象和确定分组的界限。( )

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