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【单选题】
从E-R图导出关系模式时,如果两实体间的联系是m:n,下列说法中正确的是 ( ) 。
A.
将m方码和联系的属性纳入n方的属性中
B.
将n方码和联系的属性纳入m方的属性中
C.
在m方属性和n方属性中均增加一个表示级别的属性
D.
增加一个关系表示联系，其中纳入m方和n方的码
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【判断题】当关键词出价不变,提高关键词质量得分就能提高直通车广告综合排名。
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【单选题】下列()可以把报表中某一单元或某一区域与另外某一单元或某一区域或其他字符之间用逻辑运算符连接起来。
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The data files in each project path cannot be modified directly
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The main function of Kingview project manager is to centrally manage Kingview projects on the machine for users
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