音速喷嘴具有精度高、性能稳定，操作方便等优点，是理想的气体流量标准设备。
Sound speed nozzles have the advantages of high-accuracy, stable-performance and convenient to operate. It is an ideal standard gas flow rate facility.
天然气孔板流量计的现场检定，采用以文丘里音速喷嘴作为标准表的传递型校准法。
The on the spot inspection of natural gas orifice meter is adopting the transitivity calibration method taking Venturi nozzle as calibration scale.
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