What concepts are described in the following sentence?

"When critical altitude is sea level, 5.0:1 is the compression ration and the supercharger gear ratio is 7:1."

Return the answer as pairs of triples.
Wasp Jr. A COMPRESSION_RATIO 5.0:1
Wasp Jr. A CRITICAL_ALTITUDE_THIS_IS_THE_HIGHEST_ALTITUDE_AT_WHICH_THE_ENGINE_CAN_ACHIEVE_ITS_FULL_CONTINUOUS_POWER_RATING._ABOVE_THIS_ALTITUDE,_POWER_FALLS_OFF_WITH_HEIGHT_AS_WITH_A_NATURALLY_ASPIRATED_ENGINE_._SEE_SUPERCHARGER#ALTITUDE_EFFECTS_FOR_DETAILS. sea level
Wasp Jr. A SUPERCHARGER_GEAR_RATIO 7:1