专业缩略语 (Abbreviations) Standard Abbreviations and Symbols AB Anchor bolts ASSY Assembly Btu British thermal unit C Celcius C.O. Change order C/C Center to center CIF Contract information form CL Center line CONC. Concrete COL. Column COLL. Collateral CPU Customer pick-up CS Clear span DET Detail dB Decibel DIM. Dimension DSD Double sliding door DWG Drawing EH (E.H.) Eave height