There was a child went forth every day,

And the first object he look’d upon, that object he became,And that object became part of him for the day or a certain part of the day,
Or for many years or stretching cycles of years.
Questions:A. Who’s the poet
B. From which poem and which collection of the poet is the quotation taken
C. What does the poet describe in the poem

不可压缩滤饼颗粒间的孔道和滤液通过滤饼的阻力均不受压强的增加而有所改变。