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冰壶比赛为啥要拼命“擦地板”？与摩擦力息息相关
source link: http://tech.sina.com.cn/d/v/2018-02-27/doc-ifyrvspi2332876.shtml
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冰壶比赛为啥要拼命“擦地板”？与摩擦力息息相关
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