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当前学科：脊柱及骨盆骨折
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男，51岁。汽车撞伤骨盆区后伤部疼痛，伴有休克，不能自行排尿，膀胱膨满，尿道口有少量血性液体溢出。直肠指诊：指套上染有血迹。休克难以纠正时，应采取的最主要的措施是（）
A . A.加快输血速度
B . 使用升压药物
C . 使用止血药物
D . DSA栓塞髂内动脉
E . DSA栓塞髂外动脉
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积垢形成的原因有哪些？如何处理？
下列关于事业单位会计的特点的说法中，错误的是（）。
市场失灵(名词解释)
Once there was a little girl who came to live in an orphanage (孤儿院). As Christmas time was drawing near, all of the other children 11 telling the little girl about the beautiful Christmas tree that would appear in the hall downstairs on Christmas morning. After their usual 12 , each child would be given their only Christmas gift, a small orange. The headmaster of the orphanage was very 13 with the kids. So on Christmas Eve, when he 14 the little girl slipping down the stairs to peek（偷看）at the much-heard-of Christmas tree, he 15 that the little girl would not receive her Christmas orange because she had been so curious as to disobey the rules. The little girl ran back to her room 16 , crying at her terrible fate. The next morning as the other children were going down for breakfast, the little girl stayed in her bed. She couldn’t 17 the thought of seeing the others receive their gift while there would be 18 for her. Later, as the children came back upstairs, the little girl was surprised to be handed a napkin (餐巾). As she carefully opened it, there, to her 19 , was an orange all peeled and sectioned (分瓣). “ How could this be? ” she asked. Then, she realized how each child had taken one section from their orange for her so that she, too , would have a Christmas orange. What an example of the true meaning of Christmas those orphan children showed that morning! How I 20 the world would show the same kind of concern for others, not only at Christmas, but throughout the year! 请在11处填上正确答案（） 请在12处填上正确答案（） 请在13处填上正确答案（） 请在14处填上正确答案（） 请在15处填上正确答案（） 请在16处填上正确答案（） 请在17处填上正确答案（） 请在18处填上正确答案（） 请在19处填上正确答案（） 请在20处填上正确答案（）
初期复苏时开放气道，畅通呼吸道的方法有（）
煤气管道坡向可遵循以下原则为（）。
机房要保持正常的温度和湿度，温度一般在（）摄氏度，湿度保持在20%-80%。
()是资产阶级上升时期占主导地位的政治学说。