与穿破硬膜外血管及注射空气有关（）
A.空气栓塞
B.硬膜外血肿
C.硬膜外脓肿
D.全脊髓麻醉
E.刺破胸膜
F.脊神经根损伤
参考答案：A
Mr. Green didn’t understand ________made his daughter so absent-minded.
A. how that was B what was it C. why it was that D. what it was that
既溶于水，又溶于乙醇的黏合剂是（）
A.MC
B.EC
C.CMC-Na
D.PVP
E.PVPP
