A content of the hydrofluorocarbon is from {HEAD ~ 1 to 60 mass %} in {TAIL ~ the working medium} for heat cycle 
in
A content of the hydrofluorocarbon is from { HEAD ~ 1 to 60 mass % } in { TAIL ~ the working medium } for heat cycle
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH