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当前学科：数据库程序设计
题目：
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数据完整性保护中的约束条件主要是指（ ）。
A. 用户口令校对
B. 并发控制的约束
C. 值的约束和结构的约束
D. 用户操作权限的约束
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简析马克思“阶级论”与帕雷托“精英论”之间的关系。
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