题目内容
从全世界范围看，欧美国家的民族矛盾普遍要比亚非国家更加突出。
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亚非国家的民族问题有相当一部分是源于欧美帝国主义殖民体系的遗留问题。
建立索引需要额外的存储代价，但使用索引扫描一定比简单的全表扫描效率要高。
关系数据库管理系统查询处理4个阶段的执行顺序为（ ）
Hello, everybody! On behalf of the hotel, I’d like to express our warmest welcome to you. We do hope all our (1)____________will feel happy and comfortable here. We would be pleased to provide (2)__________ services to meet your needs. Here you can find many convenient facilities for you to use, such as a (3)_________, a healthy club and an indoor swimming poor. We also have three restaurants (4)_________ Chinese and Western foods, two bars and a large shopping center. Any suggestions for (5)_______ our service are welcome. Thank you for your attention.
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