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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(1)\"><em></em>下载文档(未登录)中学物理电流和电路知识点描述：想要学好物理基本概念要分清，基本规律要熟记，基本方法要记住。课文必须熟悉，知识点必须记得清楚。下面是小编整理的中学物理电流和电路知识点，仅供参考希望能够帮助到大家。中学物理电流和电路知识点一、认识电路1、电路：电路是把电源，开关，用电器用导</a>';
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