【机械工程】管道、导管、管【生活】管道，导管，预应力

watering arrangement with perforated pipe-line located above the soil

fluid compression for conveyance in pipe-line systems

pipe-line system for viscous products

dynamic multifunctional pipe-line【计】

water trap in pipe-line systems

sewer (sewer pipe-line)

bare pipe-line

spray aperture sprinkler pipe-line