A.關(guān)閉,關(guān)閉B.關(guān)閉,打開(kāi)C.打開(kāi),打開(kāi)D.打開(kāi),關(guān)閉
A.管道順序號(hào)B.工段號(hào)C.物料代號(hào)D.設(shè)備類(lèi)別代號(hào)
A.30B.40C.50D.60