如图所示，用压强计研究液体内部的压强：当压强计的金属盒在空气_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题问答题

如图所示，用压强计研究液体内部的压强：当压强计的金属盒在空气中时，U形管两边的液面应当相平，而小明同学却观察到如图所示的情景．出现这种情况的原因是：U形管左支管液面上方的气压______大气压（填“大于”、“小于”或“等于”）

答案

当压强计的金属盒在空气中时，由于U形管左右两管上方的气压相同，都等于大气压，根据连通器原理可知U形管两边的液面保持相平；现在没有压力作用在U形管的橡皮膜上U形管左支管的液面却低于U形管右支管的液面，这是由于U形管液面上方的气压不同造成，且气压越大管中的液面就会越低，因此出现图中这种情况的原因是：U形管左支管液面上方的气压大于大气压；

故答案为：大于．

选择题

— What has fur?

— __________.[ ]

A. An elephant

B. A tiger

C. Fish

问答题

Task 5
Conversation: The following are two business letters. After reading them, you should give brief answers to the 5 questions (No. 56 through No. 60) that follow. The answers should be no more than 3 words. They should be written after the corresponding numbers on the Answer Sheet.

Letter One
Dear Sirs,
On 5th October I bought one of your expensive "Apollo" fountain pens from Julian’s, a big department store of this town. Unfortunately I have been unable to use the pen because it leaks and fails to write without making blots. I am very disappointed with my purchase.
On the advice of Julian’s manager I am returning the pen to you and enclose it with this letter for correction of the fault.
Please arrange for the pen to be fixed or replace it with a new one and send it to me as soon as possible.
Letter Two
Dear Sirs,
Thank you for your letter of 9th October enlosing the defective "Apollo" fountain pen, received today. We very much regret that the pen you bought has given you trouble.
Normally each of our pens is individually examined before being passed into store and it is hard to understand why this one escaped examination. We have passed your pen to our quality control department for inspection and report. Meanwhile, we are arranging to replace your pen with a new one.
We extend our apologies for the inconvenience this matter has caused you, but are confident that the replacement pen you will be receiving will prove satisfactory.

When was the Letter One writtenIt was written ______.