[填空题]
(a) What resonant freq380c;.iwsmnx8kdiuq su7bu ( uency would you expect from b4cm n 05.0wh.wripyrllowing across the top of an empty soda bottle that is 18 cm deep, if you assumed it was a closed tube?p 0r..h05yirwm cln4 w Hz (b) How would that change if it was one-third full of soda? Hz
