“direct-current vacuum-tube voltmeter”的概念、定义、翻译、参考文献-科学参考

单词	direct-current vacuum-tube voltmeter
释义	direct-current vacuum-tube voltmeter [dǝ¦rekt ¦kǝ·rǝnt ¦vak·yǝm ¦tüb `vōlt´mēd·ǝr] ^ELECTRONICS The amplifying and indicating portions of the diode rectifier-amplifier meter, which are usually designed so that the diode rectifier can be disconnected for dc measurements.
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