The on the spot inspection of natural gas orifice meter is adopting the transitivity calibration method taking Venturi nozzle as calibration scale.

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。

youdao

The metering of natural gas still presently depends on orifice flowmeter, one of differential pressure flowmeters.

天然气计量现在仍以差压式流量计中的孔板流量计为主。

youdao

The differential pressure fluctuation has a quite great influence upon the measure precision in measuring natural gas flow rate with the measuring device by use of standard orifice plate.

在采用标准孔板节流装置测量天然气流量时，盖压波动对测量精度影响甚大。

youdao

While natural orifice surgery "isn't ready for prime time, maybe it's a steppingstone to something else, " Shikora said.

CNN: Use of natural openings may ease weight-loss surgery