Piv nrog tungsten cathodes, lanthanum hexaborate (LaB6) cathodes muaj qhov zoo xws li kev ua haujlwm qis electron khiav, siab emission electron ceev, tsis kam mus rau ion bombardment, zoo tshuaj lom neeg, kev ua haujlwm ruaj khov, thiab kev pab lub neej ntev. Nws tau ua tiav siv ntau yam ...
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