英语词汇tetragonal selector是什么意思，tetragonal selector的用法、释义、翻译、读音、例句、短语词组-英汉汉英翻译词典-觉斋网

单词	tetragonal selector
释义	tetragonal selector　矩形上升回转选择器(一种较新式的步进制自动电话总机)
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