underground conduit

基本解釋

Two other cables from the receiving equipment drop in trunking in the central service duct of the tower block and then continue underground in 25 mm polythene conduit.
另外兩個電纜從在大樓中央服務(wù)管中繼接收設(shè)備，然后繼續(xù)下跌地下25毫米聚乙烯管道。
The karst water-filling mines in Hunan province occur widely, which can be divided into two types. that is, karst water-filling mine and underground river conduit water-filling mine.
我省巖溶充水礦床較為廣泛，可分為巖溶充水和暗河管道充水礦床兩個類型，前者包括水文地質(zhì)條件簡單、中等和復(fù)雜三個亞類。
Note: 1. The laying method in correspondence with D category in the table 1-18(GB/T16895.15-2002), which is suitable for the direct cable burying or cable layout in the underground conduit.
注： 1。敷設(shè)方式對應(yīng)于表1-18（GB/T16895.15-2002）中的D類，適用于電纜直接埋地或電纜敷設(shè)在地下的管道內(nèi)。