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为确保管道中液流为层流，管道中雷诺数应小于液流从层流变紊流时的雷诺数

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听力原文：DavE.Hi, this is Helen, Sorry this is late notice, but I just need to update you on the trip to Bern there've been some changes. First, Something for your briefcasE.We're holding prices on the list at the same level as last year, but with all the product changes, you do need to have the latest catalogue with you. And, on top of talking to the marketing people, you'll need to set up a meeting with someone I've just found out they've appointed a new IT co-ordinator, so you'll need to organise a session with him, obviously. And it's vital that you set aside some time to go through the strategy document carefully - it's got to be agreed soon, before we set the new targets. And finally - sorry there's so much! - they've been carrying out some market research, so be sure, once you've done your presentation, you remember to say you want to see the findings should be interesting. 01~ well that's it for the time being.
&8226;Look at the notes below.
&8226;You will hear an answerphone message about arrangements for a business trip.
Conversation One
&8226;Look at the notes below.
&8226;You will hear an answerphone message about arrangements for a business trip.
Bern trip - changes
need to take (1) ........................
have meeting with the (2) ........................
important to check the (3) ........................
ask to see results of (4) ........................
未知题型
听力原文：For most nations, exports and imports are the most important international activity. When nations export more than they import, they are said to have a favorable balance of tradE.When they import more than they export, an unfavorable balance of trade exists.
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未知题型
As you know, science has had great effect on our lives since the ancient timE.Nowadays science has a closer relation with our lifE.What’s the latest development in science and technology and how does it affect out lives. Write an essay of about 400 words on the following topic:
THE EFFECT OF SCIENCE AND
TECHNOLOGY ON OUR LIVES
In the first part of your writing you should present your thesis statement, and in the second pan you should support the thesis statement with appropriate details. In the last part you should bring what you have written to a natural conclusion or a summary
Marks will be awarded for content, organization, grammar and appropriacy. Failure to follow the above instructions may result in a loss of marks.
Write your essay on ANSWER SHEET FOUR.
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