词汇	mayday relay
释义	mayday relay 转发遇险通报{无线电话用语}
随便看	Differential Pressure Unit differential pressure valve differential pressure water level gauge differential-pressure water level indicator differential-pressure water-level transmitter differential price Differential price method differential prices differential pricing differential pricing policy differential pricing system differential primary ideal differential prime ideal Differential principle differential-privacy differential proarography differential probe differential proces differential procesin differential process differential processing differential products differential profit differential profit ratio differential projected element