UID:201617
UID:203159
内容来自Android手机客户端
UID:203590
UID:198690
UID:172803
UID:161754
ybqxfn:脚踏其实并不是简单的往前是紧,轴心相对于脚踏转动方向的摩擦力是向后的,也就是说单纯考虑这个力脚踏实际是越踩越松,比如拿着脚踏一根轴心,不上满螺纹装在曲柄上往前摇,轴心是会脱落的。但实际情况这个摩擦力很小毕竟是培林的,并不会让脚踏脱落,脚踏受力是很复杂的,反而会 .. (2024-11-16 08:09)
UID:36484
UID:6381
UID:198678
UID:194378
UID:34964