煤气管道

gas hourly space velocity

exploitative engineering of offshore petroleum-gas reservoir【油气】

jet-propulsion plants having more than one gas turbine

gas socket, quick-acting pipe coupling with cut-off apparatus

exhaust steam preheater, waste gas feed heater

centrifugal gas cleaner

tungstun-inert-gas arc welding

feed-water preheating with exhaust steam and smoke gas