tunnel for flood releasing and scouring sand
Leveling embankment for flood releasing
single-bath composite auxiliary agent for scouring and bleaching
flood and sand discharging
flood releasing and energy dissipation
flood scouring and silting
increasing of flood and sand
sand and flood along the railway line
Excavation of tunnels and chambers
jet flow gallery ventilation for tunnels with one inclined shaft and two parallel tubes
Tunnels and underground structures
accounting for and control of material
artificial forestland for sand control
by order and for account of one
coal pillar for sand proof
concrete without sand for underwater stracture