热门试题
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14. 在某学生信息数据库中设定学生的"性别"属性值只能是男或女,这种约束属于关系模型的
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1.Strange thing happens to time when you travel. Because the earth is divided into twenty-four time zones one hour apart, you can have days with more or fewer than twenty-four hours, and weeks with more or fewer than seven days.If you make a five-day trip across the Atlantic Ocean, your ship enters a different time zone every day. As you enter each zone, the time changes the hour. Travelling west, you set your clock back; travelling east, you set it ahead. Each day of your trip has either twenty-five or twenty-three hours.If you travel by ship across the Pacific you cross the international date line. By agreement, this is the point where a new day begins. When you cross the line, you change your calendar the full day, backward or forward. Travelling east, today becomes yesterday; travelling west, it is tomorrow!(5分)1.1The best title for this selection is____.(1分)A. Trip Across the AtlanticB. How Time Changes Around the World C. Crossing the International Date LineD. How Time Zones Were Set Up
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30、阐述广告策划工作流程
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In ________, Shakespeare has not only made a profound analysis of the social crisis in which the evils can be seen everywhere, but also criticized the bourgeois egoism.
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