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题目：
单选题
A热效应与空化作用
B振动与冷却
C空化作用与冷却
D强度与振动
E热与细胞壁的破裂
答案：
<查看本题扣1积分>
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什么是经营成本、机会成本、沉没成本？它们在工程项目经济分析中有何意义？
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属于孕激素的生理作用是（）
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超声最早能显示胎心的周数为（）
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部门风险分析报告的报告对象可以是（）。
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矩形截面梁发生平面弯曲时，横截面的最大正应力分布在（）。
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有关桡骨小头半脱位的临床表现，下列哪项是错误的（）
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治疗痄腮常用的灸法是（）。
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维吾尔族人口有（）。
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在保存Word文档时可以省略扩展名，这时候系统会在文件名后自动加上扩展名（ ）。
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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. ___6___内的正确选项为（）