脊柱裂最常见的形式是_________及_________缺如,椎管向_________开放,好发于_________。
参考答案:棘突、椎板、背部、腰骶部
Last summer I went to Lu Xun's hometown and visited the house _________ he was born. [ ]
A. that
B. there
C. which
D. where
下列转头标识代表固定角转头的是()
A.FA
B.V
C.SW
D.CF
E.Z