9[判断题] 计算机病毒具有生物病毒的破坏性、传染性、寄生性和潜伏性的特征。（） A.正确 B.错误 - 查题网

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河南成教 / 大学计算机基础

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9[判断题]
计算机病毒具有生物病毒的破坏性、传染性、寄生性和潜伏性的特征。（）

A.正确

B.错误

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大学计算机基础

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高等数学

按照库仑强度理论，岩石破坏时破裂面与最大主应力作用方向的夹角为（）45° 45°+φ/2 45°-φ/2 60°岩土力学

无机化学(含实验)

题型描述: 阅读理解Do you like to eat out? Do you like to eat quickly? Do you like inexpensive food? Some people go to fast-food restaurants for these reasons. In the past, people usually went to diners（小餐馆）for these reasons. In fact, many people in the States still go to diners today for the same reasons.A man named Walter Scott had the first “diner” in 1872. It wasn’t a real diner. It was only a food cart. People on the street walked up to the cart to buy food. These carts served late-night workers who wanted a cup of coffee and a late-night meal. The meal was a sandwich or boiled eggs. In 1887, Samuel Jones built the first diner big enough to allow the customers to come inside. However, they did not sit down. Later, people built diners with counters and stools, and people sat down while they ate.Before long, many diners stayed open around the clock. In other words, people were able to eat in diner at any time. Diners changed in other ways, too. The original menu of sandwiches and coffee became bigger. It included soup, favorite dishes, and a breakfast menu. In addition, diners soon became permanent buildings. They were no longer carts on wheels.Diners today look similar to the diners of the early 1900s. They are usually buildings with large windows. Inside, the diners have shining counters with stools, booths, and tables and chairs. People can eat all three meals in a modern diner.Today, many people eat in fast-food restaurants such as McDonald’s and Burger King. However, the diner remains an American tradition, and thousands of people still enjoy eating there. It was popular a century ago, and it is still popular today.1、 A man named Walter Scott had the first “diner” in 1872. Why is the word “diner” in quotation marks(引号)？ A. Because it is spelled differently from “dinner”. B. Because it is a special kind of restaurant C. Because the first diner was not what it is now. D. Because diner was a new word. 2、 What meals did the first diner serve? A. Only lunch. B. Only breakfast. C. Only night-meals. D. All of the above. 3、 According to paragraph 3, diners changed in _ _ _ _ _ _ _ _ _ _ . A. three ways B. four ways C. two ways D. five ways 4、 Which of the following is NOT true according to the passage? A. Burger King is a fast-food restaurant. B. The menu included more food than sandwiches and coffee. C. Sandwiches became bigger. D. Diners existed before a fast-food restaurant. 5、 The main idea of the passage is that _ _ _ _ _ _ _ _ _ _ _ _ _ _ . A. the diner is a traditional, popular place to eat in the United States B. diners are different from fast-food restaurants in many ways C. Samuel Johns built the first diner big enough to allow the customers to come inside D. American diners serve many types of food 24 hours a day to their customers统考英语A

经过改进的地面节水灌溉方法有( )。细流沟灌小管出流长畦分段灌渗灌灌溉排水新技术

5[多选题] 在色谱法中，根据速率理论： A.使用适当细粒度和颗粒均匀的填充物，并尽量填充均匀、紧密，是减小涡流扩散，提高柱效能的有效途径。 B.载气的线速度越小，则组分在气相中停留时间越长，分子扩散项就越大。 C.采用粒度小的填充物和相对分子质量小的气体（如H2）作载气可减小Cg值，提高柱效能。 D.适当降低固定液的液膜厚度df，增大组分在液相中的扩散系数Dl，可减小液相传质阻力，提高柱效能，改善色谱峰形。仪器分析