搜索 - 科创

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这许多的笔记簿中，保存着他数十年的想法、设计、图稿等等的成绩，以及部下所进行的无数的实验。　　在研究工作中，爱迪生对于实用性非常重视，从不把自己束缚在抽象的数学推导和繁难的计算中。

朗诵和演讲；(四)音乐欣赏；(五)制成会说、唱、哭、笑的玩具，作为馈送儿童的礼物；(六)家庭录音用：记录孩子谈话、临危者最后遗言等；(七)报时用：提醒人们进餐、开会或从事其他预定工作；(八)名人谈话的永久保存

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