【单选题】正在转运或等待转运的,或已装在运输工具上的存货称为( )。
【简答题】专门的关系运算包括 ________ 、投影、连接、除运算等。
【简答题】在关系代数中专门的关系运算包括 、投影、 、除等运算
【简答题】在关系代数中专门的关系运算包括选择,投影、【 】、除等运算。
【判断题】专门的关系运算包括选择、投影、连接和除运算等。
【单选题】______ is unfit for the office. A. It seems to me that B. It seems to me that he C. That seems he D. That seems to him that
B.
It seems to me that he
D.
That seems to him that
【简答题】专门的关系运算包括()、()、()、除等运算。
【判断题】专门的关系运算包括选择、投影、连接和除运算等。
【简答题】Now, talk about what sickens you and what bugs you in your life.(造两个句子) ---- It sickens me to see / It sickens me that .. ----It bugs me to see/It bugs me that..
【单选题】四章六节P123正在转运或等待转运的,或已装在运输工具上的存货称为( )。