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to phrases
thermionic tube
avia.
热
阴极
电子管
el.
热离子管
(valve)
;
热
阴极,发射
电子管
;
真空管
(valve)
;
热电子管
space
热阴极电子管
;
热离子管
thermionic tube:
3 phrases
in 1 subject
Technology
3
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