Warning: file_put_contents(): Only 0 of 6364 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/201990.com/index.php on line 55 radiotelephony是什么意思，radiotelephony的翻译，radiotelephony音标、读音、用法和例句_耀久九英英词典
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. 电子管的首次使用将使长途无线电话变为可能。