短語(yǔ)詞組短語(yǔ)upstream dam face 上游壩面vertical upstream face 垂直上游面upstream face of dam 上游壩面vertical crack in upstream face 上游面豎向裂縫upstream pumping mechanical face seal 上游泵送機(jī)械密封vertical crack on upstream face 劈頭縫 返回 upstream face