对于必须手术的血友病病人,麻醉应尽量避免的操作有()。
A.局部浸润麻醉
B.椎管穿刺
C.经口快速气管内插管
D.经鼻插管
E.环甲膜穿刺
参考答案:A, B, D, E
The question that puzzled them is ____ they can get rid of the air pollution in the area.
A.how is it that
B.that how
C.what is it
D.how it is that
动物性发泡剂特点是什么?