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一个物体受到多个力时，什么条件下，这些力就可以都画在受力物体的重心上，什么条件下就不能移动？ 知乎 Template






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sketch 2318
sketch 1287 No smoke
sketch 828 Were Fools
sketch 5127 Captain America by Mark Phillips
sketch 5198 Sakura Claudio Pose Jester Genso
sketch 3254 derp
sketch 282
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sketch 846 cat fridayz z z zzzz zz
sketch 3327 Megaman by Abdelwahab Haik
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tomski一个物体受到多个力时，什么条件下，这些力就可以都画在受力物体的重心上，什么条件下就不能移动？ 知乎 coloring
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