试题与答案

喘证的发病机理主要在()。A.肺和肾 B.肺和心 C.心和脾 D.肺和脾 E.心和肾

题型:单项选择题 A1型题

题目:

喘证的发病机理主要在()。

A.肺和肾

B.肺和心

C.心和脾

D.肺和脾

E.心和肾

答案:

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参考答案:D解析: 本题考查关系运算的相关知识。关系代数包含以下关系运算:选择——返回满足指定条件的行;投影——从数据集合中返回指定的列;笛卡尔积——是关系的乘法,它将分别来自两个数据集合中的行以所...

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