题目内容
无限长直圆柱体，半径为R，沿轴向通有稳恒电流，电流在横截面上均匀分布。设圆柱体内( r < R )的磁感强度为Bi，圆柱体外( r > R )的磁感强度为Be，则有
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有一长直金属圆柱面，沿长度方向通有稳恒电流I，电流在圆柱面上均匀分布。圆柱面内空腔各处的磁感强度等于_______。
One of the most successful, influentialand beloved women in American history, Eleanor Roosevelt once said that she hadone regret: she wished she had been prettier. Who hasn’t felt the same way? Weare all too ______ of our physical imperfections. To overcome them, we spendbillions upon billions of dollars every year on cosmetics, diet products,fashion, and plastic _______.Why do we care so much about how we look? Because it _______. Because beauty is powerful. Because even when we learn to value people mostly for being kind and wise and funny, we are still moved by beauty. No matter how much we ____________ it or pretend to be immune, beauty ______ its power over us. There is simply no escape.Our _________ to physical beauty is not something we can control _____ . We are born with it. Experiments conducted by psychologist Judith J. Langlois showed that even small infants prefer to look at attractive faces. Before they have met a single supermodel, before they have watched a single TV show, before they have opened up a single fashion magazine, they are drawn to the same faces which adults have ______ to be attractive.There are more important things in life than beauty. But as Etcoff says, “We have to understand beauty, or we will always be ________ by it.” If you aim to be wise and kind and funny, it doesn’t mean that you can’t also try your best to look beautiful. There’s no reason to __________________ being moved by beauty’s power. It moves us all.
环境、背景方面也是戏剧舞台美术的两个重要方面。
四棱柱的一个视图反映底面实形，另两视图的图形特征是()。
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