具有变刚度特性的弹簧是（下面所列的①②③④个选项，至少有2项是正确的。点击你认为正确的选项组合） ①主、副钢板弹簧 ②扭杆弹簧 ③空气弹簧 ④油气弹簧①、②、③、④①、③、④、④③、④ ②、③、④ - 查题网

>> 国家开放大学 / 汽车构造

国家开放大学 / 汽车构造

正确率：100%

具有变刚度特性的弹簧是（下面所列的①②③④个选项，至少有2项是正确的。点击你认为正确的选项组合） ①主、副钢板弹簧 ②扭杆弹簧 ③空气弹簧 ④油气弹簧
①、②、③、④

①、③、④

、④

③、④

②、③、④

积分

汽车构造

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高等数学

当莫尔应力圆与抗剪强度线相切时，土体处于下列哪种状态？破坏状态极限平衡状态安全状态静力平衡状态岩土力学

A.正确 B.错误高等数学

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

四角号码发是一种以数码来代表汉字四角的笔形，并据此来排列汉字顺序的编排方法。正确错误汉语通论

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