Model HHLJG Volume tube is used to calibrate the metering properties of volume type and velocity type flowmeters that can output pulse signals.是什么意思_Model HHLJG Volume tube is used to calibrate the metering properties of volume type and velocity type flowmeters that can output pulse signals.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句