The oil medium flow standard devices are analyzed in this paper.
本文对油介质流量标准装置进行了分析。
This paper introduces a test system of vibration standard devices.
介绍振动基准装置测试系统。
Quartz crystal resonators are devices that supply standard time base.
石英晶体谐振器是一种提供基准时基的器件。
Quartz crystal resonators are devices that supply standard time base.
石英晶体谐振器是一种提供基准时基的器件。
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