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vacuum-tube switch
vacuum-tube transmitter
vacuum-tube video amplifier
vacuum-tube voltage regulator
vacuum-tube voltmeter
vacuum-tube-type high-frequency converter
vacuum-tube-type highfrequency converter
vacuum-type automatic bottling machine
vacuum-type drum filter
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vacuum-tube voltmeter
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vacuum-tube voltmeter
Definitions
[1] 电子管电压表
[2] 电子管伏特计
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vacuum-tube voltmeter