一道物理填空,会采纳,在线等

如果明白,并且解决了你的问题,
再问： ��ַ�ܷ�������
再答： http://www.jyeoo.com/math/search?c=0&q=%E5%A6%82%E5%9B%BE%E7%94%B2%EF%BC%8C%E6%A0%B9%E6%8D%AE%E5%B0%8F%E7%A3%81%E9%92%88%E7%9A%84%E6%8C%87%E5%90%91%EF%BC%88%E9%BB%91%E8%89%B2%E4%B8%BAN%E6%9E%81%EF%BC%89%EF%BC%8C%E7%94%BB%E5%87%BA%E7%A3%81%E6%84%9F%E7%BA%BF%E7%9A%84%E6%96%B9%E5%90%91%EF%BC%88%E6%AF%8F%E6%9D%A1%E9%83%BD%E7%94%BB%EF%BC%89%EF%BC%8C%E5%B9%B6%E6%A0%87%E5%87%BA%E7%A3%81%E9%93%81%E7%9A%84N%E3%80%81S%E6%9E%81%E6%9D%A5%EF%BC%8E