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HELVETICA:肯定是轻在后啊,后面是传动轮。前面是从动轮。传动轮轻圈轻了,发力轻松,而从动轮在前面,可以保持惯性。 (2015-04-23 14:42)
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内容来自Android手机客户端
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图片:截屏_2015-04-24-02-18-57.png
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