hard valve
Electronics (now chiefly historical )
noun
A thermionic valve or tube with a hard vacuum, or evacuated sufficiently for any remaining gas not to affect its performance.
Origin
Early 20th century; earliest use found in Wireless World.
| 单词 | hard valve |
| 释义 | hard valveElectronics (now chiefly historical ) noun A thermionic valve or tube with a hard vacuum, or evacuated sufficiently for any remaining gas not to affect its performance. Origin |
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