What are the meanings of the letters in the CB, DB CS, DF DM of the light steel keel? Seeking different people to explain ah
CS: C-type superior keel, should refer to the ceiling 60 bearing keel: 60 * 27 * 1.2, DF: ceiling cover keel or ceiling vice keel or ceiling to pay keel anyway are covered keel, DM is the main keel (main) The ceiling carries the keel
(50 * 19 * 0.5, 50 * 20 * 0.6, 60 * 27 * 0.6), DB: Ceiling keel is not on the people (including the ceiling bearing keel: 38 * 12 * 1.0 and ceiling cover keel)
