男性，38岁，全麻复合硬膜外麻醉下行肺癌根治术，麻醉满意，手术顺利，手术完毕，患者清醒，拔除气管导管。
下列哪项不是PCEA的镇痛优点（）。
A.镇痛作用确切，副作用少，对机体干扰小
B.患者可根据止痛效果自行调整用药，使镇痛作用更完善，副作用降低到最少
C.不用担心导管脱落和感染等问题
D.血药浓度平稳，镇痛作用稳定，不产生欣快感，极少发生呼吸抑制
E.多种参数设计保证PCA的安全性
参考答案：C
Everyone needs friends . There is an old saying,“Friends are God`s way of taking care of us.” But how do you ____real friendship and keep it? The American writer Sally Seamans tells young students some good____to find friends. Sally says finding friendship is3__planting a tree. You plant the seed and ____it to make it grow well. First, you should choose a friend. What makes a good friend? It is not because a person has money or good loook. A good friend should be____and patient. For example, if you have a bad day, a good friend should listen to____complains and do his or her best to help. To make a friend, you cannot be____shy. You should make each other happy and share your lives. But things cannot always be happy. Even the best friends have fights. What should you do____you have a fight with your friends? You have to talk to him or her . If he or she doesn`t want to talk, you could write a letter. There are three steps to make you____friends again. Tell him or her how you are feeling; say what your friends has done is wrong, and explain why you did this or that. Remember that friendship is the____important thing in your life.
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