“二力平衡”练习

2014-04-02 09:08苏志远
关键词:二力桌面上志远

苏志远

1.一个茶杯静止在桌面上,它在______和______的作用下保持______状态,我们就说这两个力是______。endprint

1.一个茶杯静止在桌面上,它在______和______的作用下保持______状态,我们就说这两个力是______。endprint

1.一个茶杯静止在桌面上,它在______和______的作用下保持______状态,我们就说这两个力是______。endprint

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