| 单词 | spark transmitter |
| 例句 | First we had the spark transmitters and then we graduated to transformers——” “And they still gave us the spark,” added Joe, taking up the theme. The Radio Boys Trailing a Voice or, Solving a Wireless Mystery I bought a kit of parts and assembled a small receiver and being so close to the powerful spark transmitter that was all I ever heard. The Dawn of Amateur Radio in the U.K. and Greece: a personal view |
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