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sep 28, 1842 - 德国迈尔发现热功当量。德国齐宁用硝基苯制得苯胺。奥地利多普勒发现多普勒效应。

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1842年德国迈尔发现热功当量。德国齐宁用硝基苯制得苯胺。奥地利多普勒发现多普勒效应。

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