期门的定位是， * * 直下（）
A.第5肋间隙
B.第6肋间隙
C.第7肋间隙
D.第8肋间隙
E.第9肋间隙
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首先提出在电子计算机中存储程序概念的科学家是______。
如图，是一种常见的活塞式抽水机示意图，请在图中画出手柄所受动力F1的力臂及阻力F2．
胃溃疡手术治疗的适应证有哪些?为什么胃溃疡的手术适应证较十二指肠溃疡宽?
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| New comers to the United States are often 1 by the schools. American schools 2 so different from schools they know in 3 of the world. American education is based on the 4 children 5 learn to think 6 . The school should be the 7 they learn to do this. 8 , children learn the "three R's" (Reading, Writing and Arithmetic), history and government(often called Social Studies) and many other 9 . They also learn 10 be independent(独立的), how to make their own judgment(判断), and how to develop their own 11 and interests. The American teacher does not 12 children in her class to sit 13 folded quietly and to say 14 . She wants them to listen attentively, to ask questions. She knows that 15 children learn from books is 16 . She also knows that, it is necessary for them to know how to use this 17 their 18 development. During Open School Week, parents have a 19 see how American education 20 . | ||||
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2014年广东省遭遇20年来最严重的登革热。登革热是登革病毒经蚊媒传播引起的急性虫媒传染病。当气温接近30℃、相对湿度在80%以上时，蚊虫最活跃。
图中戊地的登革热疫情较广东省的严重，其原因是（）
A.相对湿度大
B.沿海洋流的影响
C.医疗卫生水平落后
D.人口流动频繁