1) What is sound? a) Energy b) Moment c) Speed 2) How string instruments work? a) on banging b) Plucking of string c) Air 3) High is amplitude-------------- sound a) soft b) Loud 4) High pitch sound will have ------------- oscillation. a) more b) less 5) Effects of noise pollution a) Headache b) Deafness c) High blood presuure d) All of the above

Табло

Визуален стил

Опции

Шаблон за превключване

Възстановяване на авто-записаната: ?