如果一次失血超过1200-1500毫升，就会有生命危险．______．_爱下问搜题

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问题解答题

如果一次失血超过1200-1500毫升，就会有生命危险．______．

答案

人体内的血量是相对稳定的，成年人的血量为体重的7%～8%．医学研究证明，如果一次失血不超过400ml，血浆和血细胞可以在短时间内通过自身的调节作用恢复到正常水平．当失血量在800-1000毫升时即20%，会出现面色、口唇苍白，皮肤出冷汗，手脚冰冷、无力，呼吸急促，脉搏快而微弱等症状，可以输血；当失血量超过1200毫升时即30%，生命就会发生危险；当失血量达到1500毫升以上即35%左右时，可引起大脑供血不足，伤者会出现视物模糊、口渴、头晕、神志不清或焦躁不安，甚至昏迷等症状，必须立即输血．可见题中的叙述是正确的．

故答案为：√

完形填空

完形填空：（每个小题1分，共20分）
One afternoon I was sitting at my favorite table in a restaurant, waiting for the food I had ordered to arrive. Suddenly I 21 that a man sitting at a table near the window kept glancing in my direction, 22 he knew me. The man had a newspaper 23 in front of him, which he was 24 to read , but I could 25 that he was keeping an eye on me . when the waiter brought my 26 the man was clearly puzzled (困惑) by the 27 way in which the waiter and I 28 each other. He seemed even more puzzled as 29 went on and it became 30 that all the waiters in the restaurant knew me. Finally he got up and went into the 31 . When he came out , he paid his bill and 32 without another glance in my direction .
I called the owner of the restaurant and asked what the man had 33 . “Well,” he said , “that man was a detective (侦探) . He 34 you here because he though you were the man he 35 .” “What ?” I said , showing my 36 . The owner continued , “He came into the kitchen and showed me a photo of the wanted man. I 37 say he looked very much like you ! Of course , since we know you , we told him that he had made a 38 .” “Well , it’s really 39 I came to a restaurant where I’m known ,” I said . “ 40 , I might have been in trouble .”

A．chatted with

D．talked about

D．calmed down

A．was to beat

B．was dealing with

C．was to meet

D．was looking for

单项选择题

患者，男，52岁。咳嗽、咳白色泡沫痰5个月，胸痛半月。胸片示右肺下叶内带近肺门处直径3cm分叶状阴影，密度不均匀，周围呈片状阴影。

最可能的诊断是

A．肺癌

B．肺结核球

C．肺转移瘤

D．肺脓肿

E．肺良性肿瘤