Electronics. A device for rapidly switching a signal on and off; cf. key, v. 8a. Also: a hand-held device with keys or on–off switches that a person…
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| 释义 | the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > [noun] > on or off device (3) keyer1929 Electronics. A device for rapidly switching a signal on and off; cf. key, v. 8a. Also: a hand-held device with keys or on–off switches that a person… Subcategories:— electronic switches (2) |
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