已知突扩前后有压管道的直径之比d1/d2 =1：2，则突扩前后断面的雷诺数之比为（）。

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国家开放大学 / 水力学（B)

已知突扩前后有压管道的直径之比d1/d2 =1：2，则突扩前后断面的雷诺数之比为（）。

A. 1
B. 0.5
C. 2
D. 0.25

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水力学（B)

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题干阅读理解：根据文章内容，判断正误（共50分）。 Tips for Team Building When you think of team building, do you immediately picture your group off at a resort playing games or hanging from ropes? Traditionally, many organizations approach team building in this way but, then, they wonder why that wonderful sense of teamwork that had been displayed at the retreat or the seminar fails to impact long term beliefs and actions back at work. I'm not averse to retreats, planning sessions, seminars and team building activities — in fact I lead them — but they have to form part of a much larger teamwork effort. You will not build teamwork by “retreating” as a group for a couple of days each year, instead you need to think of team building as something you do every single day. • Form teams to solve real work issues and to improve real work processes. Provide training in systematic methods so the team expends its energy on the project, not on trying to work out how to work together as a team to approach the problem. • Hold department meetings to review projects and progress, to obtain broad input, and to coordinate shared work processes. If there is friction between team members, examine the work processes they mutually own — the problem is not usually their personalities; instead, it is often the fact that the team members haven't agreed on how they will deliver a product or service, or the steps required to get something done. • Build fun and shared occasions into the organization's agenda — hold pot luck lunches, take the team to a sporting event, sponsor dinners at a local restaurant, go hiking or go to an amusement park. Hold a monthly company meeting, sponsor sports teams and encourage cheering team fans. • Use ice breakers and teamwork exercises at meetings — these help team members get to know each other, share details about each others lives, and have a laugh together. • Celebrate team successes publicly. There are many ways you could do this, for instance by buying everyone the same T-shirt or hat, putting team member names in a draw for company merchandise and gift certificates. The only thing limiting you is your imagination. If you do the types of teamwork building listed above, you'll be amazed at the progress you will make in creating a teamwork culture, a culture that enables individuals to contribute more than they ever thought possible — together. 操作提示：正确选T，错误选F。 1. Team building event is traditionally related to playing games at resort.回答TF正确获得2.00分中的2.00分 2. The author claims that playing games together is as important as form teams to solve real work issues and to improve real work processes for team building.回答TF正确获得2.00分中的2.00分 3. “Retreat” in the first paragraph means withdrawal of troops after a defeat.回答TF正确获得2.00分中的2.00分 4. Ice breaking motivates team members compete with each other.回答TF正确获得2.00分中的2.00分 5. A good teamwork culture enables individuals make more efforts together.回答TF正确获得2.00分中的2.00分反馈答案：1.T 2.F 3.F 4.F 5.T 解析： 1. 这是一道细节题。本题询问传统团队建设活动是如何进行的。文章第一段指出When you think of team building, do you immediately picture your group off at a resort playing games or hanging from ropes? Traditionally, many organizations approach team building in this way…所以传统的团队建设就是玩游戏一类的活动，所以选T。 2. 这是一道主旨题。根据文章内容作者认为玩游戏的作用不大，组织团队去解决工作中的实际问题，促进工作进程才是好办法，所以选F。 3. 这是一道词义辨析。此题对应文章第一段的内容，retreat的原意是撤退，结合上下文的意思是休息寓所，所以选F。 4. 这是一道细节题。文章第六段指出Use ice breakers and teamwork exercises at meetings – these help team members get to know each other, share details about each other's lives, and have a laugh together，所以破冰活动的功能是让团员相互认识了解，增进感情，并不是激励他们相互竞争，所以选F。 5. 这是一道理解题。文章第八段的a teamwork culture, a culture that enables individuals to contribute more than they ever thought possible – together的意思就是好的团队文化能让个体聚在一起做出更多努力，与题目意思一致，所以选T。管理英语4