comparisoncompasscomplexcompositioncompoundcompound oilcompresscompressioncompression ratiocompression refrigerationcompressive strengthcompressorcomputationconcentrateconcentrationconcretecondensatecondensationcondensecondensercondensingcondensing equipmentconductconductionconduction of heatconductivityconductorconduit supportconduletconecone roofconformityconnectconnecting rodconnectionconservationconsistencyconstantconsumeconsumptioncontactcontact pointcontactorcontactor towercontentcontinuecontinuitycontinuouscontourcontour line