【判断题】在销售数据正常的情况下,存销比过高或过低都是库存情况正常的体现 ( )
【判断题】在销售数据正常的情况下,存销比过高或过低都是库存情况正常的体现 ( )
【单选题】设关系R、S、W各有10个元组,则这三个关系的自然连接的元组个数为()
【简答题】听短文,选答案。 1. How many days do we have? A. One day. B. Two days. C. Three days. 2. How was the weather on that day? A. Snowy. B. Rainy. C. Windy. 3. What did I do when I had to stay at home? A. I did my...
【简答题】句子转换. 1. Where is your pen pal from? Where _______ your pen pal _______ from? 2. How was the weather last weekend? _______ was the weather _______ last weekend? 3. We have many rules in our school. __...
【简答题】句型转换 (每空0.5分,20空,共10分) 小题1:How’s the weather in Wuhan?(改为同义句) _____ _____ the weather _____in Wuhan? 小题2:They are enjoying themselves in the park. (改为同义句) They are ______ ______ _______ ______ i...
【单选题】设关系R、S、W各有10个元组,则这三个关系的自然连接的元组个数为( )
【单选题】设关系R、S、W各有10个元组,则这三个关系的笛卡尔积的元组个数是( )
【单选题】设关系R、S、W各有10个元组,则这三个关系的自然连接的元组个数为()