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Dobrý deň, v testových úlohách sa vyskytla otázka: "Číslo skupiny A v periodickej sústave je rovnaké ako najvyššie kladné oxidačné číslo prvkov I. až VII. skupine (okrem O a F)." Vedel by mi to…
Dobrý den, potřebovala bych pomoct s nasledujúcím příkladem: "Urči akustickou rychlost a akustickou výchylku pokud je akustický tlak 2.10-5 Pa a frekvence 1kHz." (pro vypočítání příkladu mi bylo…
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