管井井点降水
Dewatering and drainage design by pipe well points
dewatering and drainage design by pipe well-points
不锈钢过滤管
stainless steel filter tube
磁过滤管道
magnetic filtering duct
Magnetic macroparticle filter
磁过滤管道磁场
filtering duct magnetic field
电解液渗滤管
cell liquor percolation pipe
多孔陶瓷过滤管
porous ceramic filter pipe
非对称陶瓷过滤管
Non-symmetrical ceramics filter tuber