| Vertical and horizontal drainage of different kinds of retaining wall; drainage in roadbed and road shoulder of road and railway; drainage in electric power ash dyke and irrigation works dyke; drainage in highway isolated area, vegetation protection and outdoor grounds for sports; drainage of transversal horizontal drill、slope protection of easy landslip、water and soil conservation in shorlder、underground drainage in land treatment projects、drainage in swale and saline alkali land alteration system |
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