“absence-of-ground searching selector”的概念、定义、翻译、参考文献-科学参考

单词	absence-of-ground searching selector
释义	absence-of-ground searching selector [´ab·sǝns ǝv `grau̇nd `sǝrch·iŋ sǝ`lek·tǝr] ^{COMMUNICATIONS} In dial telephones, an automatic switch which rotates, or rises vertically and rotates, in search of an ungrounded contact.
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