容易并发休克的头皮损伤是()
A.头皮裂伤
B.头皮下血肿
C.帽状腱膜下血肿
D.骨膜下血肿
E.头皮撕脱伤
参考答案:E
What is the definition of a path
A.A sequence of vertices and the edges formed by each successive pair of vertice
B.A walk with distinct vertice
C.A walk with distinct edge
D.None of the above
在关系模式R(U) 中,X,Y是U中的属性组,如果X→Y,并且对于X的任何个真子集X',都有X'→Y,则称
A) Y函数依赖于X B) Y对X完全函数依赖C) Y对X部分函数依赖 D) R属于2NF