How might you ask for 1/10 of a liter of water? A
“One deciliter of water, please!”
B
“I’ll take one centiliter of water.”
C
“I would like a milliliter of water if isn’t too much trouble.”
D
“Bring me a liter of water quickly!"

The correct answer is “order of importance from most to least important.”

The description of the organization of this excerpt from the library of the Congress is by order of importance from most to least important.

Almost all the libraries in the United States uses the classification of the U.S.  Library of Congress or the Dewey system to organize books in the shelves. To arrange the books, the system uses letters and numbers. So the student ora n individual can look for the title in the catalog, search for it on the web, and then goes to the correct shelf an find the book.