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轮箍在高速转动过程中产生的离心力，是随圆周速度平方的增加而对应增加，因此高速机车要发展整体车轮，以利于安全。
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男性，19岁，左膝、右足跟腱周围肿痛2周，右足跟行走痛1个月来诊。否认外伤及阴冷潮湿史。无发热。患者跟腱周围肿痛体征提示（）
Dream for Better We all have plans and dreams for a better, more ___1___ life. Yet only a small percentage of people actually achieve their ___2___ .A good question is: why? Recently, I was working with a young man who was ___3___ get on his feet. He had written out his goals, and he had powerful reasons why he wanted to achieve these goals. But after weeks of trying, he was still not much further along. So we took some time to try to understand what was holding him ___4___ .As we examined his average day, it became apparent to me that he was much too ___5__ .He was spending lots of time doing lots of different things. I ___6___ that most of what he was doing was not very important in the greater scheme of things. We did some exercises to ___7___ which activities were important, which ones were urgent and which ones was filling (or killing) time. As it turned out, most of the things he was doing throughout the day were filling time. He wasn't comfortable ___8___ he was very busy, so he created things that needed to be done. He was always working on something—yet at the end of the day, he had rarely accomplished any tasks to move him closer to the life he wanted. This behavior is fairly easy for an outside observer to spot but extremely difficult to self-diagnose. The ___9___ is to slow down and get comfortable with being still, with contemplating what we really want and whether our actions are suitable for our goals. Many of our activities are avoidance activities: we do things to fill up the time and thus avoid having to do more difficult tasks. It wasn't easy, but once the young man finally accepted that he needed to do less overall but more of the important things, his life took a dramatic ___10___ for the better. ___7___内的正确选项为（）
下列措施可以降低交通音的有（）
抗战时期是重庆高等教育的鼎盛时期，连同原有和新办的20余所高等院校和专科学校，重庆共有高等院校和专科学校（）余所。
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