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单词
drop indicator
释义
drop indicator
drop indicator
[
¦dräp ′in·də‚kād·ər
]
(communications)
Indicator for signaling, consisting of a hinged flap normally held up by a catch; the catch is released by an electromagnet, allowing the flap to drop when a signal is received.
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更新时间:2025/10/31 2:24:21