overhanging siphon spillway的意思|示意
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悬挑虹吸溢洪道
overhanging siphon spillway的网络常见释义
悬挑式虹吸管溢洪道 悬挑式虹吸管溢洪道 overhanging siphon spillway 带梯井式楼梯 staircase of open-well type; staircase of quarter-turn type ..