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>> 高等继续教育 / 公司财务
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佳题速递：
1.现有一批采用后张法制作的屋架，下弦4根预应力筋为直径18mm的PSB830精轧螺纹钢筋，其剖面图尺寸如图5-1所示，已知预应力筋的公称截面面积An=254.5mm2。试求：（1）预应力筋张拉控制应力σcon；（2）确定张拉程序并计算单根预应力筋的张拉力。建筑施工技术 编写程序，计算并输出下面级数前n项中(n＝50)奇数项的和。
1*2*3+2*3*4+3*4*5+……+n*(n+1)*(n+2)+…VisualBasic程序设计 新中国初期社会主义三大改造是？中国特色社会主义理论体系 从教育投资结构上考虑，义务教育投资在教育投资分配中的地位和作用．被称作义务教 育投资___________。教育经济学 8、
Believe it or not, optical illusion (错觉)can cut highway crashes. Japan is a case in point. It has reduced automobile crashes on some roads by nearly 75 percent using a simple optical illusion. Bent stripes, called chevrons (人字形), painted on the roads make drivers think that they are driving faster than they really are, and thus drivers slow down. Now the American Automobile Association Foundation for Traffic Safety in Washington D. C. is planning to repeat Japan‘s success. Starting next year, the foundation will paint chevrons and other patterns of stripes on selected roads around the country to test how well the patterns reduce highway crashes. Excessive speed plays a major role in as much as one fifth of all fatal traffic accidents, according to the foundation. To help reduce those accidents, the foundation will conduct its tests in areas where speed-related hazards are the greatest—curves, exit slopes, traffic circles, and bridges. Some studies suggest that straight, horizontal bars painted across roads can initially cut the average speed of drivers in half. However, traffic often returns to full speed within months as drivers become used to seeing the painted bars. Chevrons, scientists say, not only give drivers the impression that they are driving faster than they really are but also make a lane appear to be narrower. The result is a longer lasting reduction in highway sped and the number of traffic accidents.
1.The passage mainly discusses _ _ _ _ _ _ _ _ . A) a new way of highway speed control B) a new pattern for painting highways C) a new approach to training drivers D) a new type of optical illusion 【外语教育&网】
2.On roads painted with chevrons, drivers tend to feel that _ _ _ _ _ _ _ _ . A) they should avoid speed-related hazardsB) they are driving in the wrong laneC) they should slow down their speedD) they are approaching the speed limit3.The advantage of chevrons over straight, horizontal bars is that the former _ _ _ _ _ _ _ _ .A) can keep drivers awakeB) can cut road accidents in halfC) will have a longer effect on driversD) will look more attractive4.The American Automobile Association Foundation for Traffic Safety plans to _ _ _ _ _ _ _ _ .A) try out the Japanese method in certain areasB) change the road signs across the countryC) replace straight, horizontal bars with chevronsD) repeat the Japanese road patterns5.What does the author say about straight, horizontal bars painted across roads?A) They are falling out of use in the United States.B) They tend to be ignored by drivers in a short period of time.C) They are applicable only on broad roads.D) They cannot be applied successfully to traffic circles. 大学英语2 对绿脓杆菌有抗菌作用的氨基苷类药物是药理学(药学专)