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国家开放大学 / 旅游安全与管理

形成性考核册

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旅游安全与管理

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设X，Y是两个随机变量，若E(XY)=E(X)E(Y),则X与Y独立。概率论与数理统计

[单选题] 为8位字节流数据提供读操作支持的类是（） A.FileInputStream B.FileOutputStrem C.FileReader D.FileWriterJava程序设计

[计算题] 某投资工程，第3年投产，生产期20年，投产后预测每年净收益144.225万元，若期望收益率为15％，第2年投资300万元，试求第1年该投资多少万元？技术经济学

某汽车产品，假设各类时间均服从指数分布，平均故障间隔时间50h,平均修复时间2h，平均维修间隔时间40h,平均维修时间4h，平均维修停机时间8h，试求：(1)固有可用度 (2)可达可用度（3) 使用可用度，下面一组的计算结果正确的是(1)0.96；(2)0.91；(3)0.83 (1)0.83；(2)0.91；(3)0.96 (1)0.96；(2)0.92；(3)0.91 (1)0.91；(2)0.83；(3)0.96汽车维修工程

题型描述: 阅读理解You speak, write a letter, and make a telephone call. Your words carry a message. People communicate with words.Do you think you can communicate without words? A smile on your face shows you are happy or friendly. Tears in your eyes tell others that you are sad. When you raise your hand in class, the teacher knows you want to say something or ask a question. You shake your head, and people know you are saying “No”. you nod and people know you are saying “Yes”.Other things can also carry messages. For example, a sign at the bus stop helps you to know which bus to take. A sign on the wall of your school helps you to find the lab. Signs on doors tell you where to go in and out. Have you ever noticed that there are a lot of signs around you that you get messages from all the time?People can communicate in many other ways. An artist can use his drawings to tell about beautiful mountains, about the blue sea and many other things. Books are written to tell you about all the wonderful things in the world and also about people and their ideas.1、 What is the main topic of the passage? A. Communication without words. B. Communication with words. C. Communication without signs. D. Communication with body language. 2、 How does the teacher know if a student wants to say something in class? A. The student may smile to the teacher. B. The student may raise his hand. C. The student may nod to the teacher. D. The student may stand up. 3、 Which of the following messages can’t be carried by signs according to the author? A. Which bus to take. B. Where to find the school lab. C. How to know a friend or an enemy. D. Where to go in or out. 4、 What is the most common way people communicate with each other? A. To write letters. B. To speak openly. C. To use facial expressions. D. To use gestures. 5、 How do we know about all the interesting things in the world according to the author? A. By listening. B. By reading. C. By watching. D. By speaking.统考英语A

改革开放和社会主义建设新时期，党面临的主要任务是：继续探索中国建设社会主义的正确道路，（），使人民摆脱贫困、尽快富裕起来，为实现中华民族伟大复兴提供充满新的活力的体制保证和快速发展的物质条件。形势与政策