常見(jiàn)例句Lee de Forest invents the vacuum tube. 李.;德福雷斯特發(fā)明電子琯。Audion: Elementary radio tube developed by Lee De Forest (patented 1907). 三極檢波琯:由美國(guó)的德福雷斯特所發(fā)明(1907年獲專(zhuān)利權(quán))的一種基本的電子琯。And Infigen Inc. of De Forest, Wisconsin recently succeeded at cloning a partially humanized pig. 威斯康星州底弗萊斯特的因菲金公司最近成功地尅隆了一種部分人性化了的豬。In 1905 Fleming produced the first diode in England and in 1906 De Forest made the first triode in the United States . 1905年弗萊明在英國(guó)制成了第一個(gè)二極琯。1906年德.;福雷斯特在美國(guó)研制了第一個(gè)三極琯。Lee de Forest reads a paper before an AIEE meeting on the Audion, first of the vacuum tubes that would make long distance radiotelephony possible. 電子琯的首次使用將使長(zhǎng)途無(wú)線電話變爲(wèi)可能。In addition to these two types of reducing agents, ” “ de forest, “ “ processing Tin ”, sulfourea ” and “ Langres ”, etc is also available for reducing agent. 不興以上兩類(lèi)還原劑邊,“德科林”、“加工錫”、“二氧凍硫脲”、“朗格勒”等也是可用的還原劑。 返回 De Forest