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高真空电子管
met.
hard tube
;
high vacuum tube
space
high-vacuum tube
tech.
hard valve
;
high-vacuum electron tube
高真空〔"硬性"〕电子管
met.
hard tube
tech.
hard valve
高真空电子管
:
4 phrases
in 3 subjects
Electronics
1
General
1
Technology
2
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