1.visual foxpro DBMS(database management system)是_ a.操作系统的一部分 b.操作系统支持下得系统软件 c.一种编译程序 d.一种操作系统 2.visual foxpro是一种_ a.数据库系统 b.数据可管理系统 c.数据库 d.数据库应用系统 3.visual foxpro DBMS基于的数据模型是_ a.层次型 b.关系型 c.网状型 d.混合型 4.visual foxpro是一种关系型数据库管理系统，这里关系通常是指_ a.数据库文件（dbc文件） b.一个数据库中两个表之间有一定的关系 c.表文件（dbf文件） d.一个表文件中两条记录之间有一定的关系 5.在visual foxpro中以下叙述错误的是_ a.关系也被称作表 b.数据库文件不存储用户数据 c.表文件的拓展名是.dbf d.多个表储存在一个物理文件中 6.用二维表数据来表示实体及实体之间联系的数据模型称为_(填空)
答案：1. b (操作系统支持下得系统软件)
2.b (数据库管理系统)
3.b
4.c
5.d
6.关系模型其他：BBBAD
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