Two rhetorical techniques for asking questions in poems

Ask the canal how clear it is, so that there is a source of living water. ——Zhu Xi's "Reflections on Reading the Book"

I wonder who cut out the thin leaves? The spring breeze in February is like scissors.

----He Zhizhang's "Ode to the Willows"

How much sorrow can you have? Just like a river of spring water flowing eastward.------Li Yu's "Poppy Beauty"

May I ask where the restaurant is? The shepherd boy pointed to Xinghua Village.----Du Mu's "Qingming"