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extremely low frequency; very low frequency (在 3〜30 kHz 的无线电频率范围内,这些频率总是靠地波传输,由于具有大功率和大的高效天线,它们可以覆盖全球。甚低频用于奥米伽导航系统) | |||
super low frequency | |||
VLF | |||
very low frequency | |||
very low frequency (3 ~10千赫) | |||
very-low frequency | |||
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very low frequency | |||
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very-low frequencies (3 千赫 ~ 30 千赫) | |||
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very low frequency | |||
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very low frequency | |||
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very low frequency |
甚 低 频 : 38 phrases in 15 subjects |