搜索 - 科创

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godswindyear 发表于 2014-1-1 08:44 那你拍个视频截图后通过你相机帧数与子弹在图上飞行幻影的距离计算呵呵，也可以。不过就是有点麻烦[s:1]

喷口和堵头为电木，发动机外壳为6061铝合金管，外直径35，内直径31总长145mm，隔热层100mm长，外直径30，共发喷口×1，堵头×1，铝合金管×1，卡簧×2，密封圈×6，

你的这个我想过，我当时是想了一个距离进行验算，当bc距离1.4cs（光秒）时，a中观测相遇时间是1s，按照红字的公式转换，在c中静止的钟过了1秒，a中就过了1*√(1-0.49)=0.714s，那么a中一秒转换为

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