搜索 - 科创

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或者绕路做，先酯还原为醛、醇，然后用过量浓氨水滴加碘单质氧化为腈：XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

\"试管倾\"的意思是说，安装大试管时，应使试管略微倾斜，即要使试管口低于试管底，这样可以防止加热时药品所含有的少量水分变成水蒸气，到管口处冷凝成水滴而倒流，致使试管破裂。

他开始用水滴，后来又用海绵，湿纸，氈，石墨薄片和油砥石等材料作试验。　　他说道：“这次我总算能在电线上传送许多清晰的字句了”。　　爱迪生在探索电话机中应用的材料时，忽然想起了“平衡电流法”。

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