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只要不使用内幕信息交易，证券公司的从业人员是可以买卖股票的。（）
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典型的以河流为主形成的三角洲在平面上呈（），由陆向海分为（）、（）和（）三部分。
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电铲高压电缆接地时，必须把接地位置电缆架起，方可作业。
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NPV（净现值）为零表明该项目在计算期内所获得的收益额（）。
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下列哪块奖牌不是在北京奥运会开幕式后比赛日的第一天决出的？（）
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政府信息资源管理的目标是单一的。
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The Olympics1 The Olympic games are an international sports competition. In the Olympics, athletes take part in many different types of sports. Some athletes compete in the Winter Olympics. s Some compete in the Summer Olympics2 The Olympic games are very old and have a very interesting history. The first Olympic Games were held in Greece in ancient times. They probably began in the eighth century, B. C. the contests were held every four years in summer. The first games lasted for only one day. There was only one contest: a short race. Only Greek men were allowed to run in the race. No women and no non-Greeks were allowed to take part. Women were not allowed to watch the race either, or to be anywhere near the racing area. But the ancient games were stopped in the fourth century, A. D,when Greece was ruled by Rome3 The Olympics were started again in the nineteenth century, after Baron Pierre de Coubertin, a Frenchman, suggested that it would he good to have the games again, but not just for Greek people. De Coubertin organized a meeting in 1894. Representatives from nine countries went to the meeting, in Paris. They agreed to start the Olympic Games again in Athens, Greece, in 1896. The Olympic Games have been held every four years since 1896 However, the games were not held three times - in 1916, 1940 and 1944-because of the two world wars4 De Coubertin also started a committee to run the Olympics. This committee is called the International Olympic Committee. It makes the rules for athletes in the Olympics5 These rules are very strict. (1) Everyone who would like to be in the Olympics must be an amateur. They must not have played the sport professionally. (2) There are no age limits. An athlete can be young or old. (3) No one can be kept out of the Olympics because of religion, color, or political ideas. (4) Only people who were born in a particular country can represent that country in the Games. (5) In each event, each country can have only three entries in the summer games, and four entries in the winter. These rules help to make sure that everyone has the same chance of winning6 The events and games are of several different types. There are individual contests, where each athlete competes alone. To win this type of contest, one athlete must be better, faster, or stronger than other athletes Some examples of individual sports are swimming, running, and walking races. In a second group of events and games, three or four athletes work as a group. These contests are usually races, and the fastest group wins. For these small groups, there are relay races in running and swimming in summer, and relays in skiing in winter. In a third group of games, teams from each country compete in sports. For teams, there are many kinds of games. They play games such as basketball, football, and volleyball. To win these games, one team must have a higher score than the other team The athletes must usually be able to catch, throw, hit, or kick a ball very well to win7 For an amateur athlete, winning in the Olympics is a great achievement. The Games are not easy to win, whether an athlete competes in the summer or in the winter. There are many excellent athletes who compete alone, in small groups, or on teams. An athlete who wins the Olympics is the best in the worldQuestions 1 一 10:1. The Olympic Games were firstly held in Greece2. There were many different types of contests in the first Olympic Games3. Women were neither allowed to run in the Greek race nor allowed to watch it4. Greece was ruled by Rome in the eighth century B. C5. The Olympics were started again in 18946. It is Barron Pierre de Coubertin that made the Olympics an international event7. Due to the two world wars, the games were not held two times8. Only the professional athletes are allowed to take Part in the Olympic Games9. An athlete who has just immigrated into another country may represent it in the Olympic Games10. Three main types of games are mentioned in the passage, i. e. the contests in which athletes compete either individually, or as a small group, or as a team
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对于无限大容量电力系统，发生短路时的短路次暂态电流I″与稳态电流I∞、短路电流Ik之间的关系正确的为（）。
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下列属于计量型参数的有（）.
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成功的企业往往把注意力放在（）。