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振动临界频率 | |||
危险频率 | |||
★ 临界频率 | |||
截止频率; 熔结临界频率; 临界振动频率 | |||
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临界频率 在电离层传播中 |
critical frequency : 22 phrases in 12 subjects |
Air defense | 2 |
Aviation | 2 |
Electronics | 2 |
Information technology | 2 |
Metallurgy | 1 |
Nursing | 1 |
Oil / petroleum | 1 |
Psychology | 1 |
Space | 2 |
Sports | 2 |
Technology | 5 |
Telecommunications | 1 |