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jokergundam:导链钉在曲柄3点钟方向受力最大,转动速度最高,小盘上大盘时最有可能出现链条滑动变速不畅的现象,导链钉处于导链槽末端防止链条滑动,使链条顺利爬上大盘 (2016-06-30 23:06)
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