低钾性碱中毒最可能出现于（）。
A.尿毒症
B.胃手术后
C.大量输血
D.术后少尿
E.严重创伤
参考答案：B
To succeed in doing an experiment,________.
A．carefulness is needed
B．carefulness is one needs
C．one needs to be careful
D．one need be careful
A．mgtgθ
B．mgsinθ
C．μmg
D．μmg
mgtgθ
mgsinθ