“permanent-magnet focusing”的概念、定义、翻译、参考文献-科学参考

单词	permanent-magnet focusing
释义	permanent-magnet focusing [`pǝr·mǝ·nǝnt ¦mag·nǝt `fō·kǝs·iŋ] ^ELECTRONICS Focusing of the electron beam in a television picture tube by means of the magnetic field produced by one or more permanent magnets mounted around the neck of the tube.
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