TheRadioAltimeter(RA)isadevice,whichaccuratelymeasurestheheightabovethesurfaceimmediatelybelowanaeroplaneupto2500ft,andisparticularlysuitedtolow-altitudeterrainclearancemeasurement.Itprovidesaninstantaneousandcontinuousreadoutontheflightdeckoftheheightabo (共 610 字) [阅读本文] >>


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