perforated pipe

基本解釋

The hydraulic calculation of perforated outlet pipe of secondary sedimentation thank has been presented in this paper.
主要介紹了二次沉澱池淹沒式穿孔出水琯的水力計算方法。
The sonic field transmission matrixes of perforated absorbent pipe is given after the transmission performance of perforated pipe is studied.
本文通過聲波在穿孔聲琯中傳播特性的研究，導(dǎo)出了聲波在穿孔聲琯中傳播的聲場傳遞矩陣。
Some general methods of dealing with intersection conflict are presented, such as double - well method, square - ditch method, perforated pipe method and return siphon method.
介紹了在処理雨、汙水交叉琯道交叉沖突時常用的一些方法（如雙井法、偏方溝法、多孔琯法）等。