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【单选题】
Which of the following sentencescan be used to establish significanceof the research subject in the Introduction Section?A.
The concept of voice has become central to the study of written discourse and has been researched extensively in recent decades in the field of L2 writing.
B.
Research on evaluative language in academic texts has tended, rather, to focus her on published research articles.
C.
In this study, we used computer simulation to model the aerodynamic effect of the existing safety and comfort features.
D.
However, the resulting cover is aerodynamically ineffective due to the shape of the umbrella.
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【单选题】质量为【图片】的质点作平抛运动，所受空气阻力【图片】，重力加速度为【图片】，初速度大小为【图片】。在平抛点质点轨道的曲率半径【图片】 ，质点的收尾速率【图片】______。
A.
，
B.
，
C.
，
D.
，
【单选题】科教兴国战略要求全面落实( )
A.
尊重人才、尊重知识的思想
B.
面向世界、面向未来、面向现代化的思想
C.
科学技术是第一生产力的思想
D.
解放和发展生产力的思想
【简答题】电阻应变效应是指金属丝的电阻随它所受的________________________的大小而发生相应的变化的现象
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