嵌顿性疝（）
A.疝内容物易回纳入腹腔
B.疝内容物不能完全回纳入腹腔
C.疝内容物有动脉性血循环障碍
D.疝内容物被疝环卡住不能还纳，但无动脉性循环障碍
E.疝内容为部分肠壁不能还纳时
参考答案：D
解析：斜疝临床病理类型和临床表现：①易复性疝：疝内容物易回纳入腹腔。②难复性疝：是疝内容物反复突出，致疝囊颈受摩擦产生粘连，使疝内容物不能完全回纳入腹腔。③嵌顿性疝：在疝环狭小而腹压突然增高时，疝内容物可强行扩张疝环和疝囊颈而进入疝囊，即形成嵌顿性疝。④绞窄性疝：疝内容物被嵌顿过久，发生动脉性血循环障碍，失去活力，甚至坏死，即为绞窄性疝。
Dear Jenny． How is it going? Are you busy with your study these days? I've been back at school nearly four weeks. I am very glad to tell you that great have taken place in our school this term. First of all, we are aked to "clean our plates" when having our meals and say to waste. Some of us used to order more than what we could eat. That was a big waste of food and money. Now we need to the food we order. We should also stop wasting in some other ways. For example, we should turn off the lights when we the classroom. And our school has opened up some for us to learn how to grow vegetables. Each class is given a small garden and our class has to grow some tomatoes and beans in our spare time. I think it'll be very interesting. Maybe I'II be able to you some beans we've grown next time. What's more, we have only two classes in the afternoon we have more time for after-school activities. I am one of the traffic safety volunteers in our school. After school, we take turns asking people in the streets near our school to the traffic rules. I think our school life is now improving! Please write back soon and tell me more about your school. Yours truly, Wang Wei
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