代谢性酸中毒的血钾浓度往往()
A.升高
B.降低
C.不发生变化
D.可发生波动
E.以上均正确
参考答案:A
With that information ____, I sought out Douglas Smith, director of the Center for Brain Injury and Repair at the University of Pennsylvania.
A.in hand
B.in the hand
C.in hands
D.in the hands
原则上,事故调查组应当自事故发生之日起( )日内提交事故调查报告。
A.7
B.15
C.30
D.60