GB/T 25127.1-2020 Low ambient temperature air source heat pump (water chilling)packages—Part 1:Heat pump (water chilling)packages for industrial & commercial and similar application
2020GB/T 25127.1-2020 Low ambient temperature air source heat pump (water chilling)packages—Part 1:Heat pump (water chilling)packages for industrial & commercial and similar application
2010GB/T 25127.1-2010 Low ambient temperature air source heat pump(water chilling) packages.Part 1:Heat pump(water chilling) packages for industrial & commercial and similar application