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回波探测
el.
sounding
tech.
reflection sounding
telecom.
echo sounding
回波[声]探测
el.
echo sounding
回波 探测:
17 phrases
in 9 subjects
Air defense
2
Earth sciences
1
Electronics
3
Engineering geology
1
Geophysics
1
Metallurgy
1
Oil / petroleum
1
Space
4
Technology
3
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