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A coverage service delivers the raster values themselves, not a picture of them.
Service address
http://www.ethionsdi.gov.et/geoserver/wcs?service=WCS&format=application%2Fx-gzip&request=GetCoverage&srs=EPSG%3A32637&version=2.0.1&bbox=482536.692181858230000%2C487535.654054310500000%2C993370.155255076100000%2C998369.117127528400000&coverageid=geonode%3Aaa17Name in the service
aa17.x-gzipaa17.x-gzip from the list and add it to your map.