单选题:以下描述中错误的是:( )。 题目分类:VF 题目类型:单选题 查看权限:VIP 题目内容: 以下描述中错误的是:( )。 A.层次数据模型可以表示一对多的联系 B.一张二维表就是一个关系 C.层次数据模型不能直接表示多对多的联系 D.网状数据模型不能直接表示多对多的联系 参考答案: 答案解析:
Ms. Shaw has her colleagues help her in the study of earthqu Ms. Shaw has her colleagues help her in the study of earthquake prediction.A.Rig 分类:VF 题型:单选题 查看答案
The girl is gazing at herself in the mirror. The girl is gazing at herself in the mirror.A.staring B.laughing C.shouting D.sm 分类:VF 题型:单选题 查看答案
Shopkeepers mistakenly believed that car-free streets would Shopkeepers mistakenly believed that car-free streets would keep away __________ 分类:VF 题型:单选题 查看答案