double-beat sluice

双向挡水闸门,double... ... ) Sluice Gate 挡水闸门 ) double-beat sluice 双向水闸 ) reverse water stop valve 反向止水钢闸门 ...

双向挡水闸门,double-beat... ... ) double-beat sluice 双向挡水闸门 ) two-way sluice 双向挡水闸 ...