题目内容

动脉插管与压力换能器连成整体用肝素溶液排好空气

A. 对
B. 错

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primary key 代表的是

A. 外键约束
B. 默认值约束
C. 主键约束
D. 标识种子

主键约束即对主键进行限制，其值不能为空也不能重复

A. 对
B. 错

Directions: The following paragraphs are given in a wrong order. You are required to reorganize these paragraphs into a coherent article by choosing from the list A—G to fill in each number box. Paragraph B and E have been correctly placed.

Lack of proper nourishment reduces their power to disease.

A. resist
B. consist
C. persist
D. assist