什么是主蒸汽管道单元制系统?
气压维护用圆管式热缩接续套管,允许接头线束最大直径160mm,允许电缆最小直径55mm,接头内电缆开口距离650mm,其型号表示为() ["RSBA160*55—650","RSYA160*55—650","RSYJ160*55—650","RSBJ160*55—650"]
何谓“两票”、“三制”?
气压维护用圆管式注塑熔接套管,允许接头线束最大直径220mm,允许电缆最小直径55mm,接头内电缆开口距离650mm,其型号表示为() ["ZPY220*55—650","ZPZA220*55—650","ZSY220*55—650","ZSZ220*55—650"]
热力学第一定律的实质是什么?它说明什么问题?
什么叫相电压、线电压?