Sergei and Mark haven't got curly hair.
Have Sergei and Mark got curly hair? - общий вопрос
Have Sergei and Mark got curly hair or straight hair? - альтернативный
What hair have Sergei and Mark got? - специальный
Sergei and Mark have got curly hair, haven't they? - разделительный
Who has got curly hair? - вопрос к подлежащему