Lead dioxide has been prepared chemically by methods in which Pb(II) compounds are oxidized to lead dioxide in the solution phase or in melts or by heating at elevated temperatures in oxygen.是什么意思_Lead dioxide has been prepared chemically by methods in which Pb(II) compounds are oxidized to lead dioxide in the solution phase or in melts or by heating at elevated temperatures in oxygen.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句