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| 莫尔斯式电码的; 点划线; 一点一划相间的 | |||
| dot-and-dash: 15 phrases in 8 subjects |
| Architecture | 1 |
| Desert science | 1 |
| Drilling | 2 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Skydiving | 1 |
| Technology | 5 |
| Telecommunications | 1 |
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