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【填空题】数据库系统中,用于存放三级结构定义的数据库称为____。
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【填空题】从最终用户来看,数据库系统的外部体系结构可分为五种类型:____、____、____、____、____。
【填空题】现实世界的事物反映到人的头脑中经过思维加工成数据,这一过程需要经过三个世界的转换,依次是____、____、____。
Fill in the blanks with appropriate verbs from the text.Something extraordinary happened the other day in that hospital. A man who was declared clinically dead, suddenly ________ to life.
Fill in the blanks with appropriate verbs from the text.I went there again two years later after the earthquake ________ .
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