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关注:1
2013-05-23 12:21
求翻译:after the pendulum is set swinging in an ellipse ,two cups are placed under it, one at the both cups as shown .是什么意思?![]() ![]() after the pendulum is set swinging in an ellipse ,two cups are placed under it, one at the both cups as shown .
问题补充: |
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