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直流 | |||
零位频率 | |||
零位频率 | |||
零频 | |||
零频率 | |||
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零频率的 |
zero -frequency : 28 phrases in 11 subjects |
Air defense | 4 |
Computers | 1 |
Earth sciences | 1 |
Electric machinery | 2 |
Electronics | 5 |
Information technology | 2 |
Oil / petroleum | 1 |
Rail transport | 1 |
Space | 4 |
Technology | 2 |
Wind Energy | 5 |