На чем основана перегонка нефти с получением из нее разных фракций: газойля, керосина, лигроина, бензина?

She used to go cheap cafés She used to wear expensive clothes She used to go out with her rich boyfriend She didn't use to drive an old car She didn't use to wear casual clothes Did you use to have Did you use to earn Did you use to eat out Did you use to eat Did you use to be