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vanhappy:是0.13公里 (2015-10-20 19:57)
凡眸:设置周长时,用力压车把,然后让车轮在地上滚动一圈,再量车轮在地上滚动过的轨迹,误差会比你单量负压力时的车胎周长要小点~~~ (2015-10-20 20:00)
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