【单选题】若将如下E-R模型转换为关系模式,则下列说法中正确的是( )。
A.
设计一个职员关系,将部门的所有属性放到职员关系中
B.
设计一个部门关系,将职员的所有属性放到部门关系中
C.
设计部门和职工两个关系,将职员的主码加入到部门关系中
D.
设计部门和职工两个关系,将部门的主码加入到职员关系中
【单选题】在三面投影图的展开图中,A点的侧面投影aˊˊ和正面投影a’的连线必定垂直于
【单选题】She ________ the national table tennis team in 1988.
【单选题】— Jack! You are wet through. Didn't you listen to the weather report this morning? — No, I didn't. I was in a hurry. Besides, it ______ when I left. [ ]
【单选题】在正投影的三面投影展开图中,A点的水平投影a和正面投影a’的连线必定与OX轴
【单选题】—____ you got to know I traveled to USA? —Through one of your colleagues.
【单选题】The upper part of him that would show above the table would ________ no doubt in the mind of the waiter.
【简答题】第一产程从有 开始,至 ,初产妇约需要 ~ 小时,经产妇 ~ 小时。
【简答题】Part B Below is a table showing the growth in the number of people who prefer to travel abroad in your city between 1998 and 2008. Look at the table and write an essay of about 120 words refere...