摘要: … offers an excellent contrast for the observation of lead in polarized light: 7 parts of glacial … antimonial lead, type metal and lead-rich white metal, a mixture of 1 cm3 nitric acid (1.40) and …
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摘要: … offers an excellent contrast for the observation of lead in polarized light: 7 parts of glacial … antimonial lead, type metal and lead-rich white metal, a mixture of 1 cm3 nitric acid (1.40) and …