A．波长长
B．波速快
C．频率高
D．看得见
答案：C
— I have ______ today, so I can't go to school.
— I'm ______ to hear that. [ ]
A．cold, sorry
B．cool, happy
C．a cold, sorry
D．a cool, sorry
患者，女性，32岁，因自发性气胸入院。经胸穿抽气治疗无效，于半小时前行胸腔插管单瓶水封瓶闭式引流。术后患者呼吸困难明显减轻，引流通畅。请问：
提示引流通畅的客观指标是什么?关于水封瓶闭式引流，护士必须告诉患者及其陪护哪些注意事项?
