搜题请搜索小程序“爱下问搜题”
问题 实验题

如图所示实验装置，容器与粗细不均匀的水平管相连，管口装有阀门， A、B、C为底部连通的敞口竖直管。容器中装有足量的水，当阀门打开水流动时，三根竖直管中的水柱最高的是       （填：“A”、“B”或“C”）管。

答案

答案：A

当阀门打开水流动，在流过的水量一定的情况下，管的横截面积越大，水流速越慢，其压强越大，水的高度越大，由于A处的水的流速最小，故该处的压强最大，水的高度最高

单项选择题

Sometimes the processes in which people are engaged are dependent upon other processes being completed first, possibly by other people. For example, on an automobile (71) , it is necessary for the body to be constructed before the doors can be added on. Attempting to add the doors first would be pointless, because there would be nowhere to attach them. Thus, if there is no body ready to have doors added, the process for adding doors has to be (72) until the process for creating the next body is complete. This is known as (73)
Obviously, there are many cases where people have to wait for other people to do something. However, if everyone in such a situation is waiting for someone else to do something first, then no one will ever be able to do anything. When discussing processes, this situation is known as (74) , because all of the involved processes are effectively dead because of locks they have on resources. Usually someone in such a situation will eventually notice and abort the process, allowing normal flow to (75) , and often warning signs can even be spotted ahead of time to avoid ’it in the first place.

A．suspended

B．broken

C．hung

D．hold
查看答案
阅读理解

Come for the Latest Movies

It’s summer movie time again. And heroes are ready to try their strength and magic on the silver screen. Check out our list of four films that look most promising to young audiences.

Harry Potter and the Prisoner of Azkaban

Release Date: June 4

Story: It’s the summer before Harry Potter’s third year at Hogwarts School of Witchcraft and Wizardry. A shadow is hanging over Hogwarts. A dangerous murderer, Sirius Black, has escaped the Wizards’ Prison. And he broke out to fulfill one task to kill Harry Potter.

Around the World in 80 Days

Release Date: June 16

Story: This version of the classic novel set in 1872 focuses on Passepartout (Hong Kong actor Jackie Chan), a Chinese thief who seeks refuge with a strange London adventurer, Phileas Fogg. Passepartout uses his martial arts skills to defend Fogg from danger as he travels around the world in 80 days to win a bet.

Spider-Man 2

Release Date: June 30

Story: Peter Parker is still coming to terms with his dual identity as the crime superhero Spider-Man. He wants to reveal his secret identity to Mary Jane, meanwhile, his Aunt May has fallen on hard times. A new villain (坏人), Dr Otto Octavius, has appeared to cause more troubles.

King Arthur

Release Date: July 7

Story: King Arthur is presented as a clever ruler who manages to unite all the knights (骑士) in Britain after the fall of the Roman Empire. Under the guidance of Merlin and the beautiful, brave Guinevere, Arthur will struggle to realize his dreams.

小题1:To enjoy the performance of Jackie Chan, you can go to the cinema on ______.

A．June 4

B．June 16

C．June 30

D．July 7小题2:In Spider-Man 2, Aunt May’s trouble is caused by ______.

A．Peter Parker

B．Mary Jane

C．Dr Otto Octavius

D．Spider Man小题3:Which of the following films is set in ancient Britain?

A．King Arthur.

B．Spider-Man 2.

C．Around the World in 80 Days.

D．Harry Potter and the Prisoner of Azkaban.小题4:In which part of a website are you most likely to find the passage?

A．Travel.

B．Entertainment.

C．News.

D．Comments.
查看答案