数据库概念设计的E-R方法中,用属性描述实体的特征,属性在E-R图中,一般使用如下所 发布时间:2018-01-10 02:04 │ 来源:www.tikuol.com 题型:单项选择题 问题: 数据库概念设计的E-R方法中,用属性描述实体的特征,属性在E-R图中,一般使用如下所列的表示。A.矩形B.四边形C.菱形D.椭圆形
题型:单项选择题 30. He _____ his potential had it not been for his desire to meet new challenges.A.would never have realizedB.would never realizeC.never realizedD.had never realized 查看答案