试题与答案

在室内质量控制规则中,对系统误差检出敏感的规则是() A.12s B.13s C.1

题型:单项选择题 A1/A2型题

题目:

在室内质量控制规则中,对系统误差检出敏感的规则是()

A.12s

B.13s

C.12.5s

D.22s

E.10X

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析: E-R模型向关系模型转换的规则如下: ①一个实体类型转换成一个关系模式,实体的属性就是关系的属性,实体的码就是关系的码。 ②一个1:1联系可以转换为一个独立的关系模式,也可以与联系的任...

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