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single-channel | |||
one way | |||
monophonic | |||
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monophonic |
单 路 的 : 15 phrases in 9 subjects |
Air defense | 1 |
Automobiles | 1 |
Aviation | 1 |
Computer networks | 1 |
Electronics | 4 |
Hydroelectric power stations | 2 |
Rail transport | 1 |
Technology | 3 |
Telecommunications | 1 |