用欧拉图表示下列概念之间的关系
学校（A）；学生（B）；大学生（C）；共青团员（D）
用真值表来证明(p→q)←→(﹁q→﹁p)是永真式。
用真值表来证明﹁（p∧q）←→﹁p∨﹁q是永真式。
已知所有的A为B，用欧拉图表示概念A与概念B之间可能有的外延关系。
用欧拉图表示下列概念之间的关系
工业（A）；农业（B）；农机工业（C）；农业机械（D）
用欧拉图表示下列概念之间的关系：
有理数（A）;整数（B）；分数（C）；无理数（D）
题目
真包含关系,交叉关系,全异关系
关于概念间关系的欧拉图是重要的考点之一。
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- 材料全屏 Singapore【*】Singapore is an independent city-state in southeastern Asia, consisting of one major island—the Singapore island—and more than 50 small islands, located off the southern tip of Malay. The city of Singapore, the capital of the country, is at the southeastern end of the Singapore Island; it is one of the most important port cities and commercial centers of Southeast Asia. The total area of the republic is 640 sq kmLow-lying Singapore Island has no outstanding relief(轮廓鲜明的) features. A central area of hills rises to the maximum height of 176 m. The country has a wet tropical climate, with an average annual temperature of 27.20℃. The average annual rainfall is 2.413 mm. the wettest months are November through January.Singapore is governed under a constitution of 1959. A president, elected to a four-year term, is head of state, and a prime minister is head of government. The president used to be selected by Parliament, but by 1991 constitutional amendment（修正案）, the president is now elected directly by the people. The Parliament is the law-making body with its 81 members popularly elected.【*】In the late 1980s the country had some 290 primary schools with 278,300 pupils and 160 secondary schools with 200,200 students. The main institutions of higher education are the National University of Singapore, several technical colleges, and a teachers college.【*】Singapore has one of the highest standards of living of any country in Asia. In the late 1980s the gross domestic product was estimated at $23.7 billion, or $8, 870 per person. The fishing industry is centered on the port of During, on southwestern Singapore Island. Industry has grown rapidly since the 1960s, and Singapore now produces a diversity of goods, including chemicals, electronic items, clothing, and processed foods, etc. Shipbuilding and petroleum refining are also important.1【单选】Paragraph 1（）AEducationBLand and ClimateCState SystemDGeneral IntroductionEEconomyFPopulation
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- Researchers did another survey after the Gallop poll.（）ARightBWrongCNot mentioned
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