问题
填空题
用______数据的形式表示实体与实体间联系的数据模型称为关系模型。
答案
参考答案：二维表格
解析： 关系模型用“二维表”来表示数据之间的联系。
搜题请搜索小程序“爱下问搜题”
用______数据的形式表示实体与实体间联系的数据模型称为关系模型。
参考答案：二维表格
解析： 关系模型用“二维表”来表示数据之间的联系。
请认真阅读下面短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。 The nine-year-old boy was attracted by the sight of my father practicing martial arts the moment he walked into the gym. As my father threw speedy punches(出拳) into the 36 bag－yet was hardly able to move it－the boy walked slowly toward him. My father, 37 of the boy’s stare, jammed a couple of sharp sidekicks into the bag to end his 38 . He picked up his towel, sat down on a nearby bench, and began 39 his face and hands. “Hey, mister,” said the boy. My father 40 at the boy, bringing the towel down off his face and putting it around to the back of his neck. “Do you know karate or 41?” the boy asked. “Actually, I know Tae Kwon Do,” my father answered. “Cool. What 42 are you?” “Black belt,” my father said. “You like martial arts?” “Yeah, and I want to know if you can show me a 43!”said the kid. “Can you show me how to 44 someone?” My father 45 for a moment before he said, “Come here.” and 46 with his hand for the boy to come 47. His expression was serious. The kid took a couple of steps closer to my father. Looking slightly 48 .As the boy moved closer, my father quickly 49 his hand straight out, 50 stopped within an inch of the boy’s chest. The boy, shocked, jumped back in clumsy 51, almost falling over himself. My father smiled, with his hand still outstretched in the boy’s direction. “Give me your 52,” my father said. The boy inched forward again, 53. My father took his hand and began to shake it 54, as if the two of them had been old friends 55 each other. “You know, kid,” my father said, “you’ll solve more problems with this move than with any other.
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