俄罗斯水球队将在世界杯对阵乌克兰队20:46
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Kinetic friction is the resistance you get when the book is sliding across the table. It’s always lower than static friction, because it’s just harder to start something moving than to keep it moving. “OK,” you’re saying, “I got it. Static when stationary, kinetic when in motion.”。关于这个话题，易歪歪提供了深入分析
Фото: Rolf Vennenbernd / dpa / Global Look Press
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