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回波放大器
huíbō fàngdàqì
geophys.
backward wave amplifier
oil
echo amplifier
space
backward-wave amplifier
回波
信号
放大器
tech.
echo amplifier
回波 放大器
:
8 phrases
in 4 subjects
Electronics
2
Geophysics
1
Radio
1
Technology
4
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