影像复习资料 - docin.com豆丁网 ay plain film） 观察心脏大血管的整体形态、轮廓和肺循环状态 最常用的摄影位置： 1. 立位后前位（posteroanterior，PA）远达像 ???? 2. 立位左侧位（left lateral，LL）像，服钡剂 其他: 右前斜位（服
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但是只有38%的贫穷国家要求前位和后位乘客均要系好安全带。
Yet only 38% of poor countries ask both front - and back-seat passengers to wear seat belts.
伦敦经济学院一向在英国排名前五，但在2007年改变排名方法后，从第17位下降到了第59位。
After a change in methodology in 2007, the London School of Economics, usually regarded as one of Britain's top five academies, crashed from 17th to 59th place.
这份研究显示在70年代，一位随机来自排名前25位之外的大学经济学教授，会因为进入哈佛后，而使得他的研究产量翻番。
The study showed that during the 1970s, an economics professor from a random university, outside the top 25 programmes, would double his research productivity by moving to Harvard.
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