空气栓塞发生的原因是：
A. 输液导管内空气未排尽
B. 导管连接不紧，有漏气
C. 加压输液输血时无人守护
D. 拔出较粗的近胸腔的深静脉导管后，穿刺点封闭不严密
空气栓塞发生后应采取左侧卧位，并保持头低足高位
A. 对
B. 错
Listen to the talk about obeying school rules.
A. So they will get better grades.
B. So they don’t get into fights.
C. So they will play safely at school and home.
D. So they will become responsible members of society.
Listen to the speech on treating your neighbours kindly.
A. It is not always possible.
B. When you live beside someone you need to berespectful.
C. If your neighbour is not kind then treat him the sameway.
D. Neighbours do not get along because they live tooclose.
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