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ratio of the mean axial flow velocity over the cross -section of upstream conduit to the acoustic velocity at the same location, teljesuunalise keskmise vookiiruse ülesvoolu juhtme ristlõikes ja akustilise kiiruse suhe samas kohas
MaC . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif/est,mul/mea/MaC/1/est (22.09.2026)
