甲状腺大部切除术后呼吸困难和窒息的原因有()。
A.切口内出血形成血肿
B.气管塌陷
C.喉头水肿
D.并发肺部感染
E.止痛药用量不足
参考答案:A, B, C
—Did you meet with the famous star yesterday?
—______ I had come a little earlier!
A.If only
B.Only if
C.But for
D.For fear
绘图题:画出电磁感应测量原理图