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内容来自iPhone手机客户端
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内容来自Android手机客户端
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gullif:关注,因为后拨有弹性,链条长一点短一点都能使轮子转起来,但是理论上应该有一个最佳长度。坐小板凳上静候高手点拨! (2016-03-24 09:23)