【单选题】A professor in Beijing University, believed that business inthe market economy must __ the right balance between theirpursuit of profits and the needs of customers. [ ]
【判断题】任何一个只包含两个属性的关系模式一定满足BC NF
【判断题】世界上主要的外汇衍生品包括是:外汇远期、外汇期货、货币掉期、外汇期权、外汇期货期权。()
【判断题】阿托品能和乙酰胆碱可逆性地竞争M受体,所以阿托品是M受体的竞争性拮抗药。
【简答题】计算题: 已知基本尺寸为ø40mm的一对孔、轴配合,要求其配合间隙为41~116um,试确定孔与轴的配合代号,并画出公差带图。
【判断题】任何一个只包含两个属性的关系模式一定满足 3NF
【简答题】One day when Jack was walking inthe park, he saw a woman he knew sitting on a bench(长椅)with a dog beside her. The dog was looking up at the woman. Jack walked up to the woman and said, “Hello. Sue, ho...
【判断题】请判断“ 任何一个只包含两个属性的关系模式一定满足3NF ” 。