搜索 - 科创

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4.对照品母液的保存，有时对照品对我们来说比金子还宝贵，否则你永远不知道自己是否已经成功,所以对照品母液用完以后一定要用封口膜密封后放进冰箱保存. 5.容量瓶应该认真洗,如果不用超声波,那就在洗液里面多泡一会吧

人们为了制成可用的白炽灯已经花了多年时间了，但唯有爱迪生才在密封于真空里的碳化灯丝上找到了答案。这种灯能发光45小时。他在1880年申请了这项发明的专利。

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