downward radiation معنى"downward radiation" أمثلة على اشعاع نازل الاشعاعات النازلة "downward" معنى "radiation" معنى "downward" معنى "downward mobility" معنى "radiation" معنى "downward dog (tv series)" معنى "downward dog pose" معنى "downward ozone transport" معنى "downward spiral of poverty" معنى "downward transport in the soil" معنى "acoustic radiation" معنى "adaptive radiation" معنى "albedo radiation" معنى "atmospheric radiation" معنى "atomic radiation" معنى "background radiation" معنى "backscattered radiation" معنى "beta radiation" معنى "beta-radiation" معنى "cerenkov radiation" معنى "cherenkov radiation" معنى "cosmic radiation" معنى "cyclotron radiation" معنى "electromagnetic radiation" معنى "epsilon radiation" معنى أمثلة A radiant barrier and an air gap below the roof will block about 97% of downward radiation from roof cladding heated by the sun.
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