皮皮学，免费搜题
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【简答题】
短文改错。 It was snowing heavy on Monday morning. Li Hua was at the bus stop, waiting for Bus No. 601 to go to school. After the while, a bus came and she got on it. Here were many passengers in the bus. Some were talking and some were looking out for the windows. All of sudden the bus stopped. The driver turned around and said,'Sorry. The bus had broken down. Please get off and help push the bus.' When she heard it, Li Hua and the others passengers got off the bus. They worked hard together, pushed the bus slowly forward. Soon the bus was running again. All the passengers were smiling and so the sun was shining. 1. _____ 2. _____ 3. _____ 4. _____ 5. _____ 6. _____ 7. _____ 8. _____ 9. _____ 10. _____
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【单选题】某医学院曾收治3例分别在院外接受过试验性肝穿刺引起急性腹膜炎的患者。术中医师在抽出脓液5～10ml后，即拔除穿刺针，术后未做常规处理.2小时后呈急腹症症状。结果2例治愈.1例死亡。下列对试验性肝穿刺的说法错误的是（）
A.
肝穿刺应该由经过训练的医师进行，一定要避免盲目性和危险性
B.
不论穿刺动机如何，只要造成事故，它的价值就是负价值
C.
只要动机是好的，虽然是事故，它也有一定的正价值
D.
医学研究的试验设计必须严密
E.
试验前必须经有关专家审定是否符合科学要求