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to phrases
直流〔电子〕管
gen.
direct-current tube
直流管
oil
battery tube
直流 管
:
20 phrases
in 11 subjects
Air defense
1
Aviation
1
Chemistry
1
Electric machinery
1
Electronics
3
General
2
Metallurgy
1
Shipbuilding
1
Solar power
1
Technology
7
Telecommunications
1
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