“photoelectric intrusion detector”的概念、定义、翻译、参考文献-科学参考

单词	photoelectric intrusion detector
释义	photoelectric intrusion detector [¦fōd·ō·i`lek·trik in`trü·zhǝn di´tek·tǝr] ^ELECTRONICS A burglar-alarm system in which interruption of a light beam by an intruder reduces the illumination on a phototube and thereby closes an alarm circuit.
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