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10楼#
发布于：2015-03-31 22:29
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![7天勇士[寒]](https://bbs.jd100.com/attachment/medal/3ae915c994fd934.jpg "7天勇士[寒]"){kind=small}
![14天勇士[寒]](https://bbs.jd100.com/attachment/medal/9aacf8cc0ea8134.jpg "14天勇士[寒]"){kind=small}
![7天勇士[春]](https://bbs.jd100.com/attachment/medal/7b734d35544b9d3.png "7天勇士[春]"){kind=small}
![14天勇士[春]](https://bbs.jd100.com/attachment/medal/0a2a8be87813938.png "14天勇士[春]"){kind=small}
![20天大作战[2015]](https://bbs.jd100.com/attachment/medal/cec543c13f7ea1b.jpg "20天大作战[2015]"){kind=small}
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11楼#
发布于：2015-03-31 22:28
E=BLV a是半径就是切割磁感线的有效长度貌似就是这样的哇咔咔，我们才学的没这么深
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12楼#
发布于：2015-03-31 22:27
（默默地自占沙发）有人吗？
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