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一点一划; 无线电发送电码点划线 |
dot-dash : 33 phrases in 14 subjects |
Architecture | 1 |
Aviation | 1 |
Chemistry | 1 |
Construction | 1 |
Desert science | 1 |
Drilling | 2 |
Electronics | 2 |
General | 4 |
Metallurgy | 2 |
Oil / petroleum | 2 |
Skydiving | 1 |
Technology | 11 |
Telecommunications | 2 |
Textile industry | 2 |