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Q: What are Xie Yi's contributions to science?A: She is part of a team who created a new ______________________ that can be used to convert ____________ or ____________ into electricity. Her work contributes to __________________ pollution and _______________ energy efficiency.
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Q: Who selected this year's (2015) five laureates?A: An independent international __________ made up of 12 _____________ scientists and researchers.
系统受力图中的内力可不画，但是该对内力对于单体受力图必须要画，且反向、共线的关系必须体现出来
画单体受力图和系统受力图时，不同的受力图中同一个力所画的形式必须一样
患者,女性,50岁。因胸闷、咳嗽、咳痰、呼吸困难、尿少就诊,既往有风湿性心脏病二尖瓣狭窄。考虑患者出现了心力衰竭,诱发心力衰竭最常见的因素是
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