【单选题】对于关系模式R(x,Y,Z),下列结论错误的是(44)。
【单选题】下面关于函数依赖的叙述中,正确的是( )。 Ⅰ、若X→Y,X→Z, 则X→YZ Ⅱ、若XY→Z, 则X→Z,Y→Z Ⅲ、若X→Y,Y→l 则X→Z Ⅳ、若X→Y,Y→Y',则X→Y'
【单选题】起重机()本身的重量一般都不应包括在额定起重量中;
【简答题】TTL集成“与非”门电路是由 、 和 三部分组成。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【多选题】下列支出中,属于现金使用范围的有( )。
【简答题】对于关系模式R(X,Y,Z),下列结论错误的是______。 A.若X→Y,Y→Z,则X→Z B.若X→Y,X→Z,则X→YZ C.若X→Z,则XY→Z D.若XY→Z,则X→Z,Y→Z A. B. C. D.
【简答题】Why does the author choose a bridge for painting?
【单选题】Why does the author refer to the election procedure established by the original Constitution?
A.
To prove to the reader that New England as a whole had more electoral votes than the state of south Carolina.
B.
To persuade the reader that Thomas Pinckney's defeat could have been avoided.
C.
To alert the reader that the procedure used in 1796 was unlike what is presently used.
D.
To encourage the reader to study Constitutional history.