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to phrases
acoustic frequency
archit.
音
烧
频
(30 赫 - 20 千赫)
avia.
声波频率
;
音频
oil
声频
;
声音频率
wind.
声频率
acoustic frequency:
22 phrases
in 8 subjects
Aviation
2
Electronics
2
Geophysics
3
Oil / petroleum
2
Shipbuilding
2
Space
1
Technology
6
Telecommunications
4
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