[Utilities – Water Supply and Drainage Section] 20181202
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In low-lying areas of water conveyance pipes (canals), water distribution networks, and pipe sections between valves, () should generally be installed as required by the project. a、pier b、air valve c、reducing valve d、drainage valve Answer: d
Water supply pipes (canals), low-lying areas in the water distribution network, and low-lying sections between valves should generally be installed as required by the project (D)