Reliability of the sealed vacuum tube is very important, and the main factor that affects reliability is its vacuum degree.
密封真空管的可靠性尤其重要，影响其可靠性的主要因素是真空度。
Reliability of the sealed vacuum tube is very important, and the main factor that affects reliability is its vacuum degree.
密封真空管的可靠性尤其重要，影响其可靠性的主要因素是真空度。
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