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问题 填空题

在进行关系数据库的逻辑设计时，E—R图中的属性常被转换为关系中的属性，联系通常被转换为 【5】 。

答案

参考答案：关系

解析： 在实体—关系图中的联系通常被转换为关系。

操作题

如图所示，OB是一束光由水中射入到空气中的折射光线， 请画出在水中对应的入射光线AO的大致方向。

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单项选择题

A．Heavy rain triggered floods which caused heavy casualties and damage.

B．Harsh drought had been going on for several years and killed some people.

C．23 people were missing after a storm hit a village in the mountainous province.

D．Authorities were searching for the people who had crossed the border from other countries.
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