channel with trapezoidal section
open trapezoidal Channel
trapezoidal open channel
box girder with trapezoidal section
(pressure)gauge with bottom connection
Boreholes on Circular Arc with Inclined Plane
carbonate oil reservoir with bottom water
channel with compound section
channel with compound sections
channel with concrete lining
channel with U-shaped cross-section
cleaning the bottom with fat mortar
constricting arc with flux strips
Cultivation with open ground
embankment with open crushed-stone side-slope
full open with retroaction
gas reservoir with bottom water