Укажите , в каком предложении использован независимый причастный оборот. 1. the electron is about as large as a nucleus, its diameterbeing about 10-12 cm. 2 . metals do not melt until heated to a definite temperature. 3 . mercury is used in barometers, having a great specific gravity.
1. ... , its diameter being about 10-12 cm.