小儿液体疗法的补液原则是()
A．先慢后快
B．先盐后糖
C．先浓后淡
D．见尿补钾
E．防惊给钙
参考答案：B, C, D, E
Had it been possible I would have gone to the movies but I _____ busy.
A．had been
B．am
C．was
D．would be
冲击地压临界深度一般大于（）m。
A、100
B、200
C、300
D、400
