游泳时，耳朵进水单跳排除法是（）
A、上岸后把头向进水耳侧倾倒
B、张开嘴
C、单脚跳几下
D、双脚跳几下
参考答案：A, B, C
张力性气胸急救原则中首先应是()
A．剖胸探查
B．气管内插管辅助呼吸
C．输血、输液治疗休克
D．气管切开
E．立即排气解除胸腔的高压状态
—Do you know going to stay in Yushu to help the homeless children?
—No, I don't know, maybe a few days. [ ]
A. when he is
B. how long he is
C. when is he
D. how long is he
