题目内容
在结扎线的下方，用小剪刀作一斜切口，动脉插管向心脏方向插入
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动脉插管与压力换能器连成整体用肝素溶液排好空气
primary key 代表的是
主键约束即对主键进行限制，其值不能为空也不能重复
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.
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