单词	中心孔道
释义	中心孔道center duct
随便看	physical data structure physical defect physical degree physical delivery physical delivery access unit physical delivery access unit--pdau physical delivery access unit，pdau physical delivery system physical dependence physical depreciafion physical depreciation physical description physical description area physical design physical design decision physical design exchange format physical design exchange format，pdef physical deterioration physical--deterioration physical development physical development project physical development proposal physical device physical device address physical device address--pda