髓外造血不可能发生于下列哪种疾病（）
A.溶血性贫血
B.缺铁性贫血
C.白血病
D.再生障碍性贫血
E.营养性大细胞性贫血
参考答案：D
We would like to take this ____ to introduce ourselves as one of the leading importers in our country
A. place
B. time
C. occasion
D. opportunity
利用过度换气降低．PaCO是降低脑压最快方法，应使PaCO维持在多少为最理想
A．20mmHg
B．25mmHg
C．30mmHg
D．35mmHg
E．40mmHg
