zhè / xiàng / diào / chá / de / fù / gài / miàn / hěn / guǎng / jī / hū / bāo / kuò / suǒ / yǒu / nián / líng / duàn

这项调查的覆盖面很广，几乎包括所有年龄段。

This survey has broad coverage and includes almost every age group.