4π ααααααααα (3ααΆαα) ααΈααΆααα’αΆα αααααα’αΆααΈαααααααΆα αα·αααααΆαααΈα‘αΌααα4 (αααααα½α)17h β’ αα½αααα, ααααααααα½α β’ ααααααααα 5 β’ ααααααααΉα 5 β’ 70mΒ²$750