杭州交通信息网国家工商总局信息网:爱迪生经过多少次实验发明了电灯（急需）
来源：百度文库 编辑：杭州交通信息网 时间：2024/05/06 05:37:19
2000多次.
6000多种材料，试验了7000多次
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