某广义表的表头和表尾均为(a,(b,c))，画出该广义表的图形表示。
参考答案：
— Were you alone at home yesterday?
— Yes, my children as well as my wife _____ invited to the party. [ ]
A. was
B. were
C. has been
D. have been
首先证明硬膜外麻醉的是（）
A.Wood
B.Corning
C.Koller
D.Bier
E.Halstead
